Saucer Separation would do nothing to increase the abilities of the dreadnought. Increasing it's turn radius really wouldn't fix anything either. It's a large slow turning megadeath machine. But there are very viable ways to get around the lunar orbit speed of it's turn radius and wreck your opponents.
It's not canon, the original dreadnought didn't do it and most likely couldn't because of the spinal lance. The spinal lance was added in such a way they'd have to cut an entirely new section of the saucer out for it to separate correctly.
Saucer separation pets are retarded and die easily. The scripting they use while at least it works, can't be controlled and the saucer separated pet tends to die very quickly due to severely decreased stats.
So again, I ask why even bother having or wanting saucer sep for the dreadnought?
[Unrepentant] Lapo@overlapo: the problem with space STF
is that you can't properly teabag your defeated opponent
Unrepentant: Home of the Rainbow Warrior and the Rainbow Brigade.