You can do that.  It's very rare that I would do that while pulling a lot of stick.  It's also risky when turning nose down out of the vertical because it's likely to induce a spin.  
Just to reiterrate though.  I'm rarely off the throttle in a turn, and the main exception when a split-s or slice is likely to blow through the bandits flight path.  If there's no risk of a flight path overshoot, I want all the E I can get.