THIS ONLY WORKS IN COOP EDIT.
If it is your first time running it:
Step 1: type /allowjstr = 1
Step 2: type /jstr PUTNUMBERHERE
Step 3: press space.
To turn it off for non-coop edit modes, type /allowjstr = 0.
I would recommend 25-350 for /jstr command.
Quote
bind space [jump; sleep 5 [if (&& (= (getmode) 1) (= $allowjstr 1)) [edittoggle; entdrop 1; newent jumppad $jstr 0 0 -1 5; edittoggle; sleep 50 [edittoggle; entfind jumppad * * * * 5; delent; edittoggle; entdrop 2;]]]]