1. Width. Having to shop mostly online it is sadly often the only thing I can go off. Also shopping in Europe where at least some brands seem to use different wood shops than for their boards sold in USA, it's difficult getting the info I'd like to have for length, wheelbase, concave, etc.
2. Yes! I think this should be heavily encouraged. Maybe then shops could also start putting the info up, so it wouldn't be such a gamble every time.
3. I guess it could help, but not really necessary for me personally. Maybe the shops would put it up easier if it had some name or code though, so in that regard it might be better.
4. Wheelbase maybe 14.5". I know 14" is a bit short for me at least, but I can deal with it also. Length 32" to 33"
5. 8.25", 14.5" wb, 32.5" long. Somewhere thereabouts. Haven't found my dream shape yet, but I do prefer slightly longer wheelbases and lengths with proper noses and tails (no short stubs). Medium concave. Definitely not mellow at least. Also, I've never tried the twin tail shapes, but I think I might like a twin tail board personally.