1) Hard to answer... if the engine is in good tune, no air leaks, primed correctly, not overheating etc etc... then its just the same as pretty much any other engine - sometimes just one pull, sometimes half a dozen or so, but its not really an issue so long as the tune, temp etc is ok. My OS engine starts and holds a tune a little better than the Cen motor - if thats any help, but theres not a lot of difference other than power tbh.

2) Only if u pull it out too far - a flick of the wrist is all it needs.

3) I believe u can, I think its the Tiger Drive that fits it - try a search in this forum, that question pops up now and again - personally i dont like to carry anymore stuff about than I need to, and the PS has always worked for me.

TNX is tempting tho - go for whatever u can get the most spares for, easily and cheaply, is my honest advice.