Well then for finding out which keyboards have a USB mouse port, you'll have to check each keyboards manufacturer's web site. :/
Warning: I don't think running a mouse FROM your keyboard is a good idea. There are situations where doing so, might make you unable to boot your comp.
I know I've had situations where one or the other (keyboard or mouse) was NOT available at reboot...like during some BSOD's. If they are wired together, thru the keyboard, you may find yourself in a situation where neither will work.
I consider mouse and keyboard wired separately, a GOOD thing. Sort of a safety valve, so you at least have one or the other available.