Also, If you change your \"run\" key to a keyboard key (like \'v\' for example) and press run, jump and fly at the same time, you get an extremely uber jump.
In addition to this, a very obscure bug exists whereby if you use either of these exploits (the jump + fly or jump + run + fly) and your character is facing a certain direction, then the effect of it will be doubled, enabling you to get some very high jumps.