there is a pretty simple way to make a boost in vc-mp.
i cannot tell you the code i had made once. but can give you a hint.
you can use player.Gravity for your functions if you want to make one.
i made this
<player.Gravity>0.002</player.Gravity>
and
<playerbootsjump>0.002</playerbootsjump>
can any one tell this is correct or not if not please tell me how i can make this
This is not the correct board to post such a question.
Next time, post all your questions about scripting, in the scripting board
So, you want to make a boost for speed or for gravity ?
I think that's pretty easy: increasem them for a few seconds, using player.Gamespeed / player.Gravity.
I don't remember the standard values for gamespeed'n'gravity, but someone should know. (however, under 0.2 I think)
By the way, the squirrel scripting platform is not supported on this forum, yet.
Check this one for that platform:
http://vcmp.liberty-unleashed.co.uk/forum/There you can get a lot more help.