I've had to do custom html post requests to get a lot of non api existing features in the various scripts I've made (things like sending pms, posting messages, generating items etc...). It's workable and something you may be able to look into but it would be much better to have api support for it.

What could be cool with this and that immediately comes to mind is notifications - the whole beauty of having a phone that's with you nearly everywhere. You could set a setting to alert you to when a gm tourney global is sent out for example. Or notifications when certain users come online or when an item is uploaded to the market at a certain price. Lots of possibilities, very intrigued.