Your rev limiter is there for a reason, leave it alone unless you engine has been worked to utilize more engine revolution. For that you need better internals and bearings
been using it for more than a year now... Trust me when i say.. u don't need it really... You will get bored of it after a few days.. It won't fark your engine, it usually depends on how often and how hard you use it.. If u set Gain to F and at low rpm's.. then you are asking for trouble..
My car now is running a stock ecu but with some upgrades. Im not too sure whether i can just leave my ecu stock or shoudl i buy a e-manage or something.