I've successfully done CGear abuse. It's not super difficult, but you're forced to go with a low frame (think 3,10, 17 for easiest results) if you want to do it efficiently. I've also done Non Cgear abuse with an AR, which is really really easy to do. OmegaDonut almost has Non CGear abuse figured out without an AR (as long as you're using a retail cartridge), so if we can get that running, then RNG abuse should be very easy.
The one thing that frustrates me is the lack of inheritance/PID control at this time. We don't know how to predict that IV's will pass. We also can't predict what nature/ability you'll get.