In regards to question three:
In the Forrest all Oro kill points reset... However in RP it is not necessarily true, but to be fair to RP, at the very least you need to 'dumb down' or weaken your assaults to match levels, so that it cannot be considered god-modding... It is what I myself have done on the multiple accounts I have. Furthermore, any special Kekkei Tota, or custom jutsu I would say would be fine to leave alone, and that, you shoudl set a specific 'rank' to which you can recover your knowledge thereof....
Of course, this is all opinion based.