I'm not sure you can get phase shift outside of 90 degree angle without using custom nodes. Adding or subtracting a scalar value wouldn't work because you would need to have those values change too during time to match the phase.
Anyway if you wan't to get 90,180,270 shift it's fairly easy. For 180 just use 1-x on sin, for 90 and -90 (270) you do the same just by using cos node. But for fine tuning like 15, 30, maybe by using custom node it would be possible, anyway I couldn't get it to work before with stock ones.
Actually, maybe even 45 angle should be possible with some simple math, this would be the formula in that case, but I would really need to test that on paper to make sure the numbers are correct
sin (x + 45) = (sin (x) + cos (x)) * sqrt (2) / 2
Last edited by Money; 06-20-2012 at 11:09 AM..