Northbeach,
Not sure quite why you'd want to clear the HUD just because you're on the ground. Most current HUDs will provide taxi speed/acceleration/decell cues and runway status (EVS) with future(?) developments such as TNASA to give positive taxi direction.
Glum,
If you consider the deep stall phenomenon on a T-Tail aircraft, I'm not sure there's such a tail geometry that can be outside of the prop wash/wing influence. The caveat being that I've only been forced to work on & program Stall systems for such birds - I'm not a Flight Scientist.