Nice coincidence - I just came here to look if there's some plans for keyboard shortcuts, and find this topic as the topmost one 
What I'm mostly looking for is "Jump to previous note" and "Jump to next note". I assume that's what Rob means with "back" and "forward"? I often edit some notes in parallel, and would love to have some way of quickly navigating between them (especially if they are in different notebooks).
I actually sometimes press Alt + left arrow to go back, before noticing that I'm not inside a browser...
A GSoC project sounds great to me! Keeping my fingers crossed 