I'd recommend checking ArtRage's 'shortcut keys' link in the Help menu for a list of the shortcut keys we use as I suspect it'll differ depending on what features you tend to use.
mapping the ALT key to one of your tablet buttons can be handy for example, as ALT+click samples a colour, ALT+right click rotates the canvas for example. The zoom strip should work to zoom in and out in ArtRage by default.
Other users may have some more feedback on this based on their own experiences though. I hope that helps!