^ same method I basically use, stole it from Murphy.
The "Show Trigger Times" thing is crucial. I can do super complicated sections with BD this way, the only time I ever do anything manually is if BD is being ridiculously stubborn and won't let me add a transient somewhere, which is always because two hits were both too close to the same beat location and it won't quantize two regions to the same place so it won't let you add a marker there.
I never select on the grid either. My basic workflow is like this...
-Select from beginning of first transient in a section to the beginning of the first transient after the section you want to edit.
-Open BD, select Region Separation, hit "Capture Selection" then correct whatever it comes up with to what you actually want it to be (a lot of the time it is off by a beat because your actual selection isn't right on the grid, like if the drummer was a bit early so I select the hit a little before the grid, it'll think my selection starts at "53|3" when really the beat is supposed to start at "54|0")
-Set the appropriate beat division (usually 8ths or 16ths)
-Hit Analyze, slide ruler around until it looks like it's getting all the right hits.
-Make sure "Show Trigger Times" is turned on and set a trigger pad of like 5-10ms to avoid flammy stuff happening (like if you have a ride and snare at the same time, but the ride is a tad early and you are quantizing to the snare, you might hear the transient on the ride twice if you have no pad on the snare trigger point)
-Go through and manually add/remove hits if necessary, usually isn't necessary for me though, probably because I record trigger splats to edit from
-While going through, check the trigger times and make sure all the notes are going to be moved to the right place. If something looks like it's going to go somewhere where it shouldn't, double click the trigger and type in the right location. This is the best part about BD, total control over what's being quantized where.
-Hit Separate
-Go to Region Conform, set your strength settings and hit conform (I always use 100% so I just leave everything at the default settings)
-Play back and make sure everything got moved to the right place, if not, cmd+z twice, go back to region separation and find the hit that went to the wrong spot and correct the trigger time, then separate and conform again
-Go to Edit Smoothing, select "Fill and Crossfade" and set it to about 5ms. I know James likes to use a fade that's half the length of the trigger pad but from my experience, the crossfade is always placed BEFORE the trigger pad anyways, so with a 5ms pad and a 5ms fade, the total distance from the beginning of the fade to the transient is 10ms and that usually works for me.
BAM, perfect drum take