Done so. But it looks weird, 40em is too few I'd say:
Yes, the 40em seems to include the sidebar, so it would need to be wider.
I installed the wrap plugin anyway (in the Geany wiki). If you want, play around with it, even at the risk Frank will hate us :). Seriously, we could at least try what's possible and then decide whether we want this or not. In general, I share Frank's opinion of a common layout and style across the wiki however in this particular case I also see the benefit of a custom max-width for the page.
As an experiment I set the width to a reasonable number. I don't think it makes the page stand out as different.
The only problem is that acronyms break headings, I think because the plugin doesn't prevent the acronym substitution in headings that the normal docuwiki does.
The simple solution I have taken is to remove the acronyms (including Geany) in the headings but its something to note when adding new ones..
Cheers Lex