But... then you have a watered down spec that is very simple. The whole complexity in Outlaw is knowing when to hold certain buffs. BS on 1 target is mediocre, but on cleave it's amazing. TB is usually bad, but if you like getting 4 Adrenaline Rushes (a 3m cooldown) in 3 minutes or really need the extra mobility while attacking on the go, it's actually quite a nice benefit. If there's tons of incoming damage, GM is quite a nice buff to hold (and honestly isn't that bad of a loss to hold onto most of the time, esp if you're having just the worst luck rolling). If RtB had a cooldown, I wouldn't play the spec because it would be incredibly boring and same-y: Roll your buff > BtE > Dispatch. Rinse-repeat each time BtE is up/RtB is down.
Buffing the weaker buffs (or melding them into the other weaker buffs)? Yes, absolutely. Adding a cooldown to RtB? No please no. The spec is easy enough once you know what you're doing.
I guess, but TBH I rather hate KS or any ability that's "channeled" like that, especially when you're a class with a resource that grows upwards and can't use KS at certain points or you're wasting said resource (energy in this case). I also don't think KS is all that great of a cooldown to begin with, especially when it doesn't at all compete with DS/BR. Making it baseline is just another button I have to remember to press once every so often.
Now making Ambush worth a damn and do something more than "a guaranteed 2 CP SS that does a touch more damage", that'd be cool. How about Ambush gives 3 CP and an Opportunity proc? How about making it give a guaranteed 2 roll? Though then Vanish becomes too good and we probably can't have that, unless we want it removed from Restless Blades (please god no).