If you have the in call recording working with the correct wavedev.dll files you'll get both sides clear including on bluetooth. 6.1 only. Doesn't seem to work on 6.5 roms.
Now for the original poster's question, recording ALL calls.
Absolutely you can. BUT, always a but.
Use an aftermarket purchased program like Resco Audiorecorder, configure to autorecord your phonecall. It works, but you'll eat your card alive if you get alot of calls!!!!!!! Trust me, I know.