Lately, I've been tweaking my site to improve touch capability- and have been eyeing a couple features. Its possible for forum owners to add these themselves, but some of them really might wanna be core.
Touch Sidebars are really needed:
https://github.com/jakiestfu/Snap.js
Something like fastclick might be nice:
https://github.com/ftlabs/fastclick
And I've yet to find a clean way to do it, but many web apps send push notifications on android- would that be possible to integrate?