Not trying to be mean or anything, but:
Sell the guitar and buy something with features you do like, instead of destroying an RG.
So far, just from reading all the posts about it: You don't like the neck, you don't like the bridge, you don't like the frets. As far as I can tell, you just don't like RGs at all. Though, you'll have a he|| of a time getting rid of it with 'I hate this guitar' scratched into the back(makes me shudder to even think about it)..
I mean, I'm not gonna go out and buy a strat or a les paul and expect it to play like my RGs.
You wouldn't leave your house wearing pants 3 sizes too large, or 2 sizes too small.. If you're uncomfortable playing a guitar, you'd be much better off selling it and buying something you would be comfortable playing.
You've got the bridge blocked with a volume knob? Can it move? Is it plastic? This is probably half the problem right there.. Are you still locking the nut? Locking nuts aren't very good used as a regular nut, they weren't designed to let the string glide over them, and it will bind on the surface.
If you're worried about being ashamed of what you've done to the guitar, don't be. Techs see a lot of thrashed stuff in their life-times.
Take it in, or do it yourself, but block that bridge off properly with wood. Both ways if you don't use it at all. Use the lock nut and fine-tuners. Adjust the neck based on the tech info on Projectguitar or here on Jemsite, raise the action slightly if you still get buzzing.. Set your intonation with the best tuner you can get, or have it done on a strobe tuner. Talk to the tech if you take it in, explain what problems you're having, and give him an idea how hard you pick(this is very important for action adjustments, believe me)...
That's all the advice I can give, and by that I mean you're using a guitar out-side what it's designed for..
IMO, I wouldn't look into filling the trem cavity on a guitar you don't like in the first place.[/i]