It's been half mentioned but just to reinforce it - if a short turnout is its own block, then you will need a LOT of resistor wheelsets at regular intervals, or as soon as the turnout block goes unoccupied, if your train hasn't cleared it, it could get derailed by a points move etc.
There are different types of block detectors, some detect on both rails, some just one. I'd definitely go for a detector that detects on one rail and stick it on the stock rail of a turnout as, with the kind of wiring you're suggesting for electrofrog, over half of the potentially already short turnout rail could be isolated from the rest, making 'full' block detection on both rails either tricky or prone to shorting the block detector.
