Yap has a few short-cut keys, such as "q" for exit, but not many. I often use "Print PostScript" and so I would be delighted if you could assign a key to it (e.g., "s").
2nd request: the first thing that I do after starting Yap is always to scroll the view to the right a bit so that my text appears in the middle (otherwise I cannot see the entire text). I would be very happy if there is a "centering" command -- horizontal centering in particular. If you could assign a short-cut key to it, that's even better! Thanks.