The SwiftKit team will sift through the suggestions and if the suggestion is feasible then we'll test how practical it'd be to implement and add it to our list.
Alright this topic has got a bit long, so here are a few things NOT to suggest:
- Video recorder/Player
- Ad blocker (it's against 3rd party client guidelines)
- MSN/TeamSpeak/Ventrilio etc plugin
- IRC scripting engine
- Embedded flash games
- World hopper/avoiding normal navigation of the RuneScape website (it's against 3rd party client guidelines)