My experience with string spacing is that if I don't need to slap, they can be pretty close, especially if I'm playing with a pick. But, I've discovered that I do like a certain amount of taper to the width. I found I much prefer the way my Starfire is set up than the way my cocobolo shorty (now in the capable hands of Pierre-Yves) was. I was planning to get a new nut for that to bring the strings closer together.
Jimmy, you are so right about drummers. The converse of that is that playing with a not so good drummer can make you feel like you don't know what you are doing. In fact, I think that Einstein's theory of relativity is at play. If the tempo of the tune is a constant (within reason of course, no need to be an automaton, music likes to breath), then the size and position of the notes make sense. If the time is off, then there's no sense of how big anything is or where it actually is. Space and time all of a sudden become unhinged and little things can be huge and a note you thought was over here is actually over there. It's a shambles!
Also, a great drummer, and really any great musician, can make a recording engineer's life easier. Last night I recorded a gig for my friend Erik Deutsch and the band he brought included Tony Mason. I was experimenting with some ribbon mics for overheads, with basically just a kick to complete the sound and the fact that he could tune the drums and play them with proper dynamics and cymbal to drum balance made for a great sounding recording. I just love great drummers!
Sadly no Alembics last night, but the bass player did have a very nice '61 P bass.