Hey Jules, this is kinda off the submix topic but i've done something very similar to your guitar trick in the past... sometimes when i want a little extra something from the guitars in a chrous or build or whatever, i'll put up an extra mic (or mult off one of the main guitar mics), usually something like a 414 a few feet off the cab, and Nuke it to death with an EL8, 1176, whatever is free and explosive... then gate that track during mixdown and trigger it from a kick or snare during the given section of the song. I especially like it gated from the snare, maybe a combo of your trick on kicks and mine on snares might help out the next Nirvana!
