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I'm not sure why you would have to use the drops. Adding or removing 14mm of spacers or stack should be easy. A lower CG will always be better as long as you can pedal freely.
An EBB will rarely end up in the front of rear of the shell since there is a very low amount of change in the overall chainstay length there. There is a much bigger change in CS length at the top an bottom an so it will more often than not place itself there. Should it end up at the end of the shell a half link will correct it and you'll be able to go a tooth up or down on the cog without upsetting the geometry significantly.
Rockers or sliding dropouts is good if you want absolutely static geometry but it will limit your frame material to steel in most cases unless you go custom.
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Zdrenka
Mr_B
That relies on being able to make full use of the drop, in which case you'd have been fine with a static BB and magic gear.
If your chain length places the BB at the front or back of the shell (as opposed to the top or bottom), you're shit out of luck and have altered the effective ST angle of the frameset.
Rocker/sliding dropouts still make more sense imo, as they offer more options (now and in future) for different brake and gear types.