[BUG] Super fast flying self-enables when in build mode

[Potenzo]

Behaviour: Enable flying by double-tap [space]. Use [shift] to toggle through the flying speeds until you're in the slowest flying speed. Press [F] to enter build/dismantle mode and the [MMB] eyedopper to select a building to build. When moving, I am now in super-fast flying mode and just slighting tapping a movement direction will have me shooting all over the map.

Expected behaviour: Flying speed should not change unless you press [shift].

Alternate behaviours that would also be OK:

• Lock flying speed to the minimum when in build/dismantle modes; and (for preference) / or (at minimum)
• Prevent use of super-fast mode unless [shift] is held down.

Speculation as to possible cause: The shift key is a bit special, as a modifier. Maybe the computer doesn't really register it reliably as a key press. It may be better to bind the controls of this mod to a regular key instead (or maybe a function key).

[Potenzo]

Oh, just to confirm, this is single player mode.