ORIGINAL: Scott Smith

Apparently WE asked for it!

Hysteresis adjustment was added at the request of some of the F3A flyers, who had become used to systems with a bit more hysteresis in their systems. This can help eliminate aircraft movement with small inadvertent movements of the sticks, such as when you're holding aileron in a roll and have to add elevator at different points. A bit of hysteresis keeps you from changing the aileron.

[link=http://www.rcuniverse.com/forum/m_5864828/anchors_5864828/mpage_1/key_hysteresis/anchor/tm.htm#5864828]Original post[/link]