Does this mod have "air-steer" enabled?  That means you can move yourself and change directions somewhat in mid-air.  This is especially useful for hook-hopping around the map using the offhand grapple and being able to navigate around turns while moving really fast.  Quake 3 did not have air-steer except for space maps where gravity was low.  I'm an old Quake 2 lithium player so the physics of that game are what I am looking for desperately.  I would be willing to host a dedicated server for this mod if it is an upgrade of Q2 lithium =)

Generations Arena mod is built on the original games player movment, speed, air-control, weapon speeds and so on, it's job is not to emulate a mod that existed to quake2.
However there are things called dmflags which indeed can make generations to play abit like those mods, im no expert on these dmflags but i suppose Phoenix can give a better answear there.

Thought to my knowledge there aint a way to specify rocket speed.

In Generations v 1.0 there will be new hooks and they will behave like in the original games except doom/earth since they didnt have any hooks but instead they have got their own unique hooks.
Once v 1.0 is out you will see what i me an

Anyways since you want air-control tried the slipgate class?

A final word: As i said before this is not an "upgraded" lithium mod but a uniqe mod that allows you to choose your favorite class in the ID games, and fight other classes that were in ID's classic games.