as "danny main" you can use "native trainer", it's a sort of control center, with save/load pos, car remember, , god mode to don't destroy vehicles and others functions you'll know in time.
To get more fps, there was a timecyc that flow work on, to disable a lot of draw distance, then, you win fps.
There's also a .txt you can do yourself, search for "commandline gta 4" on google, you'll find the way to do one.
I hope you understand me, my english isn't rly good, I'l doing ma best.