Flexible/automatic alternative to multienum?

Question

I'd like to typeset the items in an enumerate environment side-by-side. Preferably, each item would take up only as much space as necessary, perhaps plus some extra padding, and the next item would be immediately after it (unless, of course, the items ran off the end of the page, in which case it should wrap to the next line, but in my situation this won't be happening).

I found the multienum package, but it only has a certain number of positioning options, rather than automatically laying out items like would normally be done with text. Its syntax may also be slightly horrifying.

Any suggestions for alternatives?

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Edit: this is what I'm eventually going for (multiple sub-items on their own line):

(a) Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
    eiusmod tempor incididunt ut labore et dolore magna aliqua.
         [ 1 2 ]          [ x 0 ]
    (i)  [ 3 4 ]    (ii)  [ 0 3 ]    (iii) etc.
         [ 5 6 ]          [-2 4 ]

(b) ...

with a reasonable amount of horizontal space between items.

Answer 1

I'd suggest inparaenum from the paralist package.

PS. The original poster asked for the way to increase spacing between items. Sorry, my answers in the middle of the night were wrong. Here is one possibility:

\documentclass{article}
\pagestyle{empty}
\usepackage{paralist}
\begin{document}
\begin{inparaenum}[\hspace{1em}1.]
\item One.
\item Two.
\end{inparaenum}
\end{document}

Answer 2

The enumitem package offers the option to typeset inline lists using enumerate*

\documentclass{article}

\usepackage[inline]{enumitem}

\begin{document}
\begin{enumerate*}
 \item one
 \item two
\end{enumerate*}
\end{document}

You can customize the joining text using itemjoin.

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Edit: Here's a mock-up of your MWE:

\documentclass{article}
\usepackage{lipsum}% http://ctan.org/pkg/lipsum
\usepackage[inline]{enumitem}% http://ctan.org/pkg/enumitem
\begin{document}
\begin{enumerate}[label=(\alph*)]
  \item \lipsum[1]
  \begin{enumerate*}[label=(\roman*),itemjoin=\hspace{2em}]
    \item $\left[\begin{array}{cc}1&2\\3&4\\5&6\end{array}\right]$
    \item $\left[\begin{array}{cc}x&0\\0&3\\-2&4\end{array}\right]$
    \item \textit{etc.}
  \end{enumerate*}
  \item \lipsum[2]
\end{enumerate}
\end{document}