Sometime last summer I noticed some of my shows weren't recording because of schedule conflicts when they shouldn't have been conflicting. Recently I figured out this is because any new recording rule I created by default starts five minutes early, and ends five minutes late. Mythtv refuses to disregard this, so any two programs in adjacent timeslots cause a conflict if there's not another tuner available.
Obviously this is BAD BAD BAD!
Because of this, for years, I used to have everything set to start on time by default. However this setting no longer seems to exist. How can I fix this? I don't trust myself to remember to manually change this every time.