It's not a game, but I've got a few Cydia tweaks for those of you with jailbroken iOS devices to make browsing these forums easier.
1. UAFaker
Setting this up to make my iPhone's Safari browser appear to sites as Google Chrome seems to have inadvertently fixed my issue with the full post editor, which made it impossible to send PMs, among other things, without going into the mobile version of the site.
2. Inspell
This custom spellchecker allows you to set your own macros to convert shortened text snippets into longer phrases, and I just now figured out that I could use it to make typing in BBcode a hell of a lot easier (typing that sentence also reminded me that you can use it to turn off the swear word filtering built into the OS). Making text bold or italic was a huge pain until I set it up to make xix and xeix open and close italic tags and xbx and xebx do the same for bold tags.