I actually did that in earlier versions while testing... nobody seem to "see" the message, they all typed /adrenaline in chat :\
I'll edit it if required, but V is not bound by default anyway and... well, I got no default already-bound action to override for that...
And the UT style adrenaline trigger doesn't really go well with people's CS stuff... I know that people just randomly press A & D while shooting, that could easily get your adrenaline regeneration starting by mistake :}
I *COULD* hook "cheer" wich is bound to "J" for HLTV usage, but I think people just unbound it because it doesn't work in regular gameplay.
So... I dunno
Added screenshots.