Have a look here for model-specific info:
http://www.ninja250.orgThe Ninja 250 is the GPX250R, they didn't get the ZZR250 in the US, this one was only available in Canada.
As far as I am aware the GPX250 engine and the ZZR250 engine are EXACTLY the same engine.
I'm pretty sure they'd pickup the sidestand issue here, it's a safety thing after all. IMHO although they do seem to stuff up pretty easily you shouldn't bridge it out.
Mick