I'm hoping (and I don't necessarily think this) that Support_Bike isn't client-sided.
No it isn't, though for some cool sidething, we will advise you to use heightcontrol (the only way we can detect if you crouch when mounted to a vehicle currently).
There will also be a server command to do this however, making it available for everyone, but just not as easy. :)
I will make sure you don't need to have Heightcontrol in order for the bikes to work, but it will help.
I am currently still in the process of rewriting Heightcontrol too, downloading the current available version (rtb archive/mirrors) will not help,
the new version will not be backwards compatible.
Also, i don't get why a lot of people immediately fear that some support script i have written contains a client side.
Heightcontrol needed it because for some reason crouching in a vehicle doesn't seem to be detectable serversided.
But that doesn't mean everything needs a client side. :P
It is also the reason why i decided to make it an add-on on it's own.
It makes more sense to have an add-on that contains the client then to put the client in every add-on that uses it.
This way everyone who has at least Heightcontrol would be able to play with Heightcontrol using add-ons.
But don't worry, Heightcontrol will be improved soon, maybe removing the need for crouching in a helicopter, while making it easier for other add-ons to use the crouch function in some way in their vehicle.
I can already safely say, you do not need to spam the space bar anymore as a non-Heightcontrolclient player, it will work for every kind of vehicle (flyingwheeled, wheeled, armor) and helicopters will not be able to fly upsidedown-ish while using the jump key anymore, at least, i wouldn't advise flying upsidedown and doing that anymore. :)