Hello George!
I have never used room mics on Borknagars albums. I think the sound will be less defined that way. I really like it for more rock/blues-like music, but the cymbals will "swim" while playing fast beats. The ambience is digital...mostly a Lexicon 480 and TC 3000 (40" x 40" studio room). I mic up the overheads, cymbals, with a pair of Neumann km84 with ortf-stereo. I use API or Neotek micpres. In the mix, I push the overheadtracks through 1176 or SSL master compressors. Asgeir used the V-drum bassdrumsound with a sound from the TD-20 module...a sound called "pillow".. On Epic we soundreplaced the V-drum signal with something else..can`t remember. On Universal, Dave was playing on ordinary bassdrums as I soundreplaced with his own bassdrumsound.
Børge