I just managed to do gammajump2 with 1 button. Probably the most obscure form of strafing and is not very well known… i guess the best given term is 1/4 beat by Ryodox, Q3 tricker. All i used was the left strafe button, the rest is mouse movement.
http://darkangel.diesa.co.uk/trickjumps/DA_gammajump2_-_1_button_strafing.dm_83