If they gave me a choice of forum I'd go for any of the following: Culture & Media, Roleplay Corner, Other Chat, Fan Fiction & Writing, Other Voting Polls, in that order.
But in all of those mentioned I think there are better candidates for one reason or another. If they were looking for someone new in Culture & Media someone like Vendak would be a better choice (and besides Abnegation's doing a great job as it is). The Roleplay section I would like, but because I haven't roleplayed in a year (because of year 12 (which I've finally finished :D)) and never on this particular forum I think whoever's handing me the modship would be hesitant to give me this one. Other Chat I'd like, because I post there a lot and there's some interesting topics, but there's tens of thousands of veteran members who would be willing to mod the forum so most likely no. I like writing fan fiction but I wouldn't feel right being the mod of the forum - as in I'm comfortable that I'd be able to do everything a mod has to do there, but I'm not as good a writer as many people in that section and it'd look kinda bad having a non-GREAT!! writer as the head of the forum. Other Voting Polls would be great as well, but as with all the forums above they're doing great as is).
I'm certainly capable of the job, but there are better candidates to choose from and I'm not fussed if I don't get picked.