Neverwinter Nights 2: Mask of the Betrayer Message Board  

like in NWN 2?

Not without directly editing the campaign files, no. Rest (as in NWN1) is handled either by a script or uses that 5 second timer we all know and hate. MotB uses a script to remove that timer and present a rest window, but it is still a bit annoying I agree.
In the NWN1 trainer, the fast rest was done by hooking the timer and setting the remaining time to 0. (Or so I surmise, anyway...) Obviously that don't work with MotB.