RAMI said:
Not speak for Glen but I think he means he mixes them down to 2 mono tracks but treats them the same...probably linking them and panning each one hard Left and Right. Which is the same as a "stereo track". Correct me if I'm wrong, G.
Yes...and no

. You have the basic idea correct, but the details can vary a bit.
By "dual mono", I do indeed mean one for stereo left channel and one for stereo right channel (I usually keep the kick as a seperate 3rd mono channel, but that's the only exception). However, the degree of panning is variable. Depending on my soundstage plan and the type of tracking I'm working with, I might hard pan, but as often as not the pan for each track could be anywhere from +/- 20% to +/- 50% or more.
It's rare, but on those times where I'm mixing a live recording of a simple acoustic trio or quartet, I might even elect to throw the whole kit some degree left or right of center *if* I'm going for a documentary reproduction of the live stage as is a common technique in many "old school" live acoustic recordings.
Anyway, the main point is when doing a stereo submix of the drumkit, regardless of the final pan spread, I prefer to throw the L and R submix tracks to seperate tracks in the editor rather than a single stereo track. The reason for this is it simply gives me more flexibility.
First in the panning, like I described above, where I can keep the full stereo image and center it where I want. While 90% of the time I'll center the kit on dead center of the panspace, there are times when I might offset it a bit (e.g. a 60% spread going from 20L to 40R). If I tried doing the same thing by panning a single stereo track to 10R, the effect would be entirely different (and usually undesireable). Also, with the single stereo track, the stereo width could not be controlled without an extra plug for stereo compression (yuck).
Second, the dual mono tracks do allow for seperate signal processing control over each side. While I would not recommend going wild with different compression between L and R, sometimes
slight differences between the two sides can help fit things together in busy mixes. But more than that, seperate EQ control between L and R can help with "tongue and groove" EQing in busy mixes. If I have to remove some mids from the right side of the drum kit because I have an organ panned mid-right that's giving me some interference, I can do that without hurting the toms and crashes on the left side. This gives the overall effect of notching out the drum kit without it sounding that notched out. It saves me from having to seperately find the right notch combination for the seperate snare and hat tracks if I don't have to; that's a real time saver is the notching is automated.
Sometimes it's better to go back to individual drum/cymbal tracks before the submix to do such notching, of course. But I don't always have individual tracks to work with (I often like to track entire kits with just 3 mics.) And even if I did, the dual-mono submix still just offers one more option of flexibility that can't be gotten with a single stereo track.
That's a lot of words, I hope it makes sense to somebody

. YMMV, but it's a technique that works well for me.
G.