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I saw it on youtube, but I guess the guy deleted the video. Its a script in what you can jump whenever you press some button... Anyone knows some script???
There is one, but I think seph's advanced movement script has a jump feature. Hold on, I'll look for it.
Edit: Yes, there is a jump feature, but I can't find a working link. Some advice, you could use the one in the link, but seph's is probably many times better.