If you use the -del- then relog, the cooldown will be removed, it is that simple, just suggesting to add a script to keep the cooldown like job missions cooldown.
Relogging to remove -del- cooldown
You shouldn't post 'exploitable' bugs in public.
The thing is, alot of players already know about this and has been using it from alot of time, I have known about it accidently and reported it ASAP.
I have confirmed this bug and logged it.