If your looking for the Camera app, it's now built into Gallery in CM10.
I've never been a Galley fan and prefer Quick Pic instead, so I've routinely have pulled the Gallery app from my builds to save space. If you delete Gallery in CM10 you loose the Camera.
Bluetooth and GPS are working fine for me. The camera is the only thing keeping this from becoming my daily driver, the voice search problems aren't a big deal for me.
Currently running with a 230MB system and 20MB cache partition, with only Dalvik on the ext partition, using S2E 1.0. It's smooth and quicker than expected.
Out of curiosity, have you tried any alternate camera apps (from the playstore or elsewhere) with gallery removed? Just wondering if the camera functionality itself is built into the gallery app, or if it's just lack of a way to launch the camera with gallery removed that is the problem...