I was using iScribble which has a shortcut key for the Eraser tool as holding down the Ctrl key. It works similar to holding down the Alt key to temporarily switch to the Color Picker tool. I've fallen in love with it, so if something that like could be implemented into ArtRage, say even for the Pencil/Eraser switch, that would be very cool.

Networking may have been mentioned before. I realise it's a tricky feature, so would be nice to have, but I understand if it's not doable. Thought I'd mention it anyway. ArtRage is amazingly cool as it is, thank you for bringing us this software and keep up the good work!