In Unreal Tournament when you double tap a directional button (or jump), you fly in that direction (or double jump)...well, it's all here.
-utds_nosave <1|0> : Sets whether or not players can jump in the air at the last second to save themselves from taking fall damage. utds_nosave 1 means they can't save themselves and utds_nosave 0 means they can save themselves.
-utds_baseforce (default 750) - Base force used to move players.
If I may say so myself this is some damn crazy fun
Version 1.3 and above are a lot
more accurate in both the angle and force used. This makes movement a lot more consistent.