Putting all the suggestions from roflmao456 together sounds more like a Messenger Activity....
Which is not a bad idea at all. You can probably do everything with it you can do now with your script, with the added benefit of having something which is already realy integrated in Messenger so you can easly chat with your contact. (and which people without Plus! can also run)
And if you take the popular GroupChat bot as an example, you can even incorporate the whole RPG world right into a bot (even with pictures in the activity panel if you like) so the bot can 'control' what you're doing and/or telling where you are, etc.... And it has no limits in how many people are chatting at the same time or with whom.
Of course, all this could be backed up by a Plus! script too (adding more features or special Plus!-powers for example; which is also a kind of an advertising for Plus!)
the hardest thing to make in games is not the GUI, but the gameplay and gamelogic itself. The screenshots show very nice things already though. I hope it gets finished... it seems like a massive undertaking... 
/ 
