author year style with biblatex

I have asked about a specific referencing style and was recommended to use biblatex. I was given a nice answer author order in plainnat

but then I would like to make minor changes:

1. The "et al." just in citing, but in references I want full author list for a paper
2. bold volume number
3. delete the "In:" preceding the journal name

I would like to know if I can add simple things to the code of the answer :

\documentclass{article}

\usepackage[style=authoryear-comp,firstinits=true]{biblatex}

\DeclareNameAlias{sortname}{last-first}

\nocite{*}

\begin{document}

\printbibliography

\end{document}

-

For (1) use the package options maxcitenames=3,maxbibnames=99. See also my updated answer to Biblatex: displaying all authors of multi-author works in the bibliography.
\DeclareFieldFormat[article,periodical]{volume}{\mkbibbold{#1}}