yes, an aftermarket computer will fix the iddle problem; such as S-AFC (even the early model AFC will do the job), Power FC. or you even can spend some money on iddle stablizer (not expensive though..), depands which way you want to go consider the $$ issue.
yes, you can get the hybrid of BOV, but chance is you don't like the sound, i.e. I like the sound comes from Blitz BOV, so I will try to have it installed and try to have stable iddle. btw, don't you know the blitz BOV will increasing 10rwkw? just j/k