Change the player's jump height

You can use the player member jumping_counter to limit the player's jump to less Olympic heights.

The jumping_counter increments from 0 (not jumping) to 1441 as follows:

0
181
361
541
721
901
1081
1261
1441

By manually setting the counter to 0 when the counter reaches one of these values, you can decrease the duration of the jump by effectively cancelling it mid-jump.

You'll need a pair of gamevars: one to hold the value of jumping_counter and one to contain the value 0.

gamevar temp 1 0
gamevar ZERO 0 0

Inside the aplayer actor, use the following code to cut the jump duration in half:

getplayer[THISACTOR].jumping_counter temp
ifvare temp 721 { setactor[THISACTOR].jumping_counter ZERO }