Well this might not be possible as I am thinking how this will be done.
Hmm, lets start by the requirement. Well it's totally up to Jake and ojii. But i recommend with more than illusion maybe 1500 - 2000.
Basicly it is maxium seconds are like 2-5 just like invis and speed. If there is a way to make this possible please do it
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I'm not talking about noclip mode, or super speed while flying. More like set their gravity to 150 something like that. For example in space_jail_v1 so you can jump to scout tower instead of going the circles so you don't get smahed into pancakes.
Well it would be awesome if you atleast consider my suggestion and see if this is possible.