The stupid hand symbol in FullScreen mode of Acrobat Reader is a nuisance.
I filed a feature request to Adobe several years ago in the hope to get something more suitable. Even an ordinary arrow would fit better than the hand. Alas, it was ignored. In older AR versions it was possible to replace the compiled-in hand icon with an arrow icon using a resource editor. But this doesn't seem to be possible anymore.
Update: cursor hidden after 3 s timeout; brighter laser dot.
As a workaround I'd suggest to compile the LaTeX source to SVG instead of PDF and use a web browser for display, such as Chromium, Chrome or Firefox. They all provide a FullScreen mode that can be accessed with F11. Moreover, these browsers are available on many platforms and for all major OS. As a bonus, they allow for embedded multimedia playback everywhere, which is not a widely spread capability among PDF viewers. And, most importantly, they all have the usual arrow in presentation mode.
With SVG, as Martin puts it in his comment, an arbitrary image file can be used as a cursor, such as this one 
, which was made with TikZ.
pdflatex laserdot
convert -geometry 20 -density 150 laserdot.pdf laserdot.png
laserdot.tex:
\documentclass[tikz,border=1pt]{standalone}
\usetikzlibrary{fadings}
\tikzfading[name=fade out, inner color=transparent!0, outer color=transparent!20]
\tikzfading[name=fade out 2, inner color=transparent!0, outer color=transparent!100]
\begin{document}
\tikz {
\shade [inner color=yellow, outer color=red, path fading=fade out] (0,0) circle (5pt);
\shade [inner color=white, outer color=yellow!90!white, path fading=fade out 2] (0,0) circle (4pt);
}
\end{document}
In SVG, laserdot.png is set as cursor icon by means of the CSS attribute cursor:
svg { cursor: url('laserdot.png') , auto ; }
Complete example:
latex beamer-example
latex beamer-example
dvisvgm --bbox=papersize --font-format=woff2 --zoom=-1 --page=- beamer-example
beamer-example.tex:
\documentclass[dvisvgm,hypertex,aspectratio=169]{beamer}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric,calc}
\usefonttheme{serif}
\usepackage[T1]{fontenc}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% PageDown, PageUp key event handling; navigation symbols <--, -->
% setting laserdot.png as cursor icon
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[totpages]{zref}
\usepackage{atbegshi}
\usepackage{tikz}
\usepgflibrary{arrows.meta}
\setbeamertemplate{navigation symbols}{}
\def\navBtnSize{9pt}
\def\navBtnLnWd{1.6pt}
\AtBeginShipout{%
\AtBeginShipoutAddToBox{%
\special{dvisvgm:raw
<style> svg {cursor: none} </style>
<defs>%
<script type="text/javascript">%
<![CDATA[%
var svgRoot=document.getElementsByTagName('svg')[0];
var cursorTimer;
document.addEventListener('mousemove', function(e){%
svgRoot.style.cursor='url("laserdot.png"), auto';
try{clearTimeout(cursorTimer);}catch(err){};
cursorTimer=setTimeout(function(){svgRoot.style.cursor='none';},3000);
});
document.addEventListener('keydown',function(e){%
if(e.key=='PageDown'||e.key=='ArrowDown'||e.key=='ArrowRight'){%
\ifnum\thepage<\ztotpages
document.location.replace('\jobname-\the\numexpr\thepage+1\relax.svg');%
\fi%
}else if(e.key=='PageUp'||e.key=='ArrowUp'||e.key=='ArrowLeft'){%
\ifnum\thepage>1
document.location.replace('\jobname-\the\numexpr\thepage-1\relax.svg');%
\fi%
}%
});%
]]>%
</script>%
</defs>%
}%
}%
\AtBeginShipoutUpperLeftForeground{%
\raisebox{-\dimexpr\height+0.5ex\relax}[0pt][0pt]{\makebox[\paperwidth][r]{%
\color{structure!40!}%
\ifnum\thepage>1%
\href{\jobname-\the\numexpr\thepage-1\relax.svg}{%
\tikz{
\filldraw[black!0!] (-1pt,-\dimexpr\navBtnSize/2+1pt\relax)
rectangle (\dimexpr\navBtnSize+1pt\relax,\dimexpr\navBtnSize/2+1pt\relax);
\draw[{Straight Barb[round]}-,line width=\navBtnLnWd] (-1pt,0)--(\navBtnSize,0);}}%
\else%
\textcolor{lightgray}{\tikz{
\filldraw[black!0!] (-1pt,-\dimexpr\navBtnSize/2+1pt\relax)
rectangle (\dimexpr\navBtnSize+1pt\relax,\dimexpr\navBtnSize/2+1pt\relax);
\draw[{Straight Barb[round]}-,line width=\navBtnLnWd] (-1pt,0)--(\navBtnSize,0);}}%
\fi\hspace{0.5ex}%
\ifnum\thepage<\ztotpages%
\href{\jobname-\the\numexpr\thepage+1\relax.svg}{%
\tikz{
\filldraw[black!0!] (-1pt,-\dimexpr\navBtnSize/2+1pt\relax)
rectangle (\dimexpr\navBtnSize+1pt\relax,\dimexpr\navBtnSize/2+1pt\relax);
\draw[-{Straight Barb[round]},line width=\navBtnLnWd] (-1pt,0)--(\navBtnSize,0);}}%
\else%
\textcolor{lightgray}{\tikz{
\filldraw[black!0!] (-1pt,-\dimexpr\navBtnSize/2+1pt\relax)
rectangle (\dimexpr\navBtnSize+1pt\relax,\dimexpr\navBtnSize/2+1pt\relax);
\draw[-{Straight Barb[round]},line width=\navBtnLnWd] (-1pt,0)--(\navBtnSize,0);}}%
\fi%
\hspace{0.5ex}%
}}%
}%
}%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\begin{frame}{Some geometric shapes}
\begin{tikzpicture}[x=2cm,y=2cm]
\foreach \a in {3,...,8}{
\node[regular polygon, regular polygon sides=\a, fill=red,
inner sep=0.3535cm] at (\a,2) {};
}
\foreach \a in {9,...,14}{
\node[regular polygon, regular polygon sides=\a, fill=blue,
inner sep=0.3535cm] at ($(\a,0)-(6,0)$) {};
}
\end{tikzpicture}
\end{frame}
\end{document}
More examples for beamer-class presentations in SVG:
Using the animate package without Adobe
http://mirrors.ctan.org/macros/latex/contrib/media4svg/example/beamer-example-1.svg (embedded video)
