tweak for Afterburner

[Starhammer]

I would like if Fly's subpower, Afterburner, could have a 1-2 second cooldown or delay after activating Fly, before Afterburner can be activated. I find that sometimes, when I turn on Fly, it "stutters" and turns off for a second before turning on again. Unfortunately, with my binds set to activate Afterburner whenever possible while Flying, that stutter then deactivates Afterburner, triggering it's 60 second cooldown 😞

Since I can't work a delay into keybinds (in a convenient or reasonable manner), it would be really handy if Afterburner itself had one.

I don't use it as often, but this applies to Double Jump as well.