Document Classes ⇒ beamer | Multi-columned Enumeration

[gale]

Hello, I have some problem with the enumeration in my beamer document:
I want to have an aligned list of the type

a. first thing b. second thing
c. third thing d. fourth thing
e. ...

with two or tree columns (which are not real columns, with multicols I can't get this)
For this I used the package multienum, which is quite good, but a bit incomplete.
I read the beamer document has its own environment to enumerate and itemize, and effectively it does not support paralist for instance. The code

Code: Select all

\newcommand{\labelenumi}{\alph{enumi}}
\newcommand{\labelenumii}{\alph{enumii}}

I putted in the preamble has no effect.
How can I format the list and the numbering?
Thanks