We should get more bottom end in traditional theory but it probably depends on all the other aspects of the cam profile.
Yep. In general, that's the idea - more low end torque though sometimes it will increase torque output across the cam's usable RPM range.
Gnarly - plug a cam in to your dyno sim program straight up, then advance it 4 or 6 or 8 degrees and watch what happens.
Here's one LCE cam that has 8 degrees of advance ground in. Their website lists all the lobe position specs for their cams and there are several other grinds with varying amounts of advance ground in.
http://www.lceperformance.com/EFI-Pro-Camshaft-22RE-RET-p/1022021.htm
Intake Exhaust
Valve Lash .008 .012
Valve Lift .442 .442
Advertised Duration 237° 240°
Duration @ .050" 216° 219°
Lobe Center 102° 119.5°
Lobe Separation 110°
Intake Opens 6° BTDC
Intake Closes 30° ABDC
Exhaust Opens 49° BBDC
Exhaust Closes -10° BTDC