I have been away from FPSC and the forums for about a month so now that i'm back I think i should make a small contribution. Here's a simple stamina style sprint script I conjured a while back. Go ahead and modify it if you wish...simply put it in a trigger zone or implement it into ure level setup files.
;Artificial Intelligence Script
;By 2S!K Productions
;Header
desc = Stamina Function
;Triggers
:state=0:newjumpheight=50,plrwobble=0,state=1
:state=1,keypressed=17 1:plrwobble=2
:state=1,keypressed=31 1:plrwobble=2
:state=1,keypressed=30 1:plrwobble=3
:state=1,keypressed=32 1:plrwobble=3
:state=1,keypressed=17 0,keypressed=31 0,keypressed=30 0,keypressed=32 0:plrwobble=0
:state=1,plrrunning:plrwobble=8,camfov=6,state=2,etimerstart
:state=2,plrrunning,etimergreater=10000:state=4,plrspeedmod=50,newjumpheight=44
:State=2,plrnotrunning:plrwobble=2,etimerstart,state=3
:state=3,etimergreater=5000:plrwobble=0,state=0
:state=3,plrrunning:state=1
:state=4,plrnotrunning:plrwobble=5,etimerstart,state=5
:state=5,etimergreater=12000:plrwobble=0,plrspeedmod=100,state=0
;End of Script
As always, Game on! -2S!K Productions