[mythtv-users] Pre/Post roll setting 1min vs 10 min

[MegaDeTH]

I used to have a preroll setting for Stargate for 1 min, but now it 
seems I can only set it for 10 min increments.

Anybody know if it's safe to change this in the database by hand?  And 
which table would hold that info?

Thanks in advance Mega