I think most folks know about resetting the hand controller using the Factory Settings function in the utilities menu. There is also a method of resetting the hand controller at power up ... by just holding down the 0 key when the power is turned on.
I know some were aware of this capability (it's certainly not new ... just not documented) ... but I have a feeling that many don't know about it. I've tried it out on a few different mounts and it's supposed to be a universal capability on any NexStar or NexStar+ HC with v4 and above (and maybe older models as well but I don't know of anyone who's tried that).
Resetting the HC clears out all the user data (time, date, location, time zone, DST) as well as any backlash correction and filter limits that have been set. I am unsure if both of these methods are exactly the same ... they seem to be but without any real in depth analysis I'm not certain.
The value of the power up reset is that you don't have to go navigating the menus, so this could be useful for a HC stuck in a specific state. Previously those with this type of problem have had to do a complete HC firmware reload. The power up reset will be faster and easier for those folks.
One thing I can't currently test is the variable slew rate settings on some of the gem style mounts. With a later MC firmware level there is capability of setting this rate and the setting is supposedly stored in the MC board. I'd be curious if either or both of the HC reset capabilities also affects the MC.
If someone felt the need to do an occasional reset I would suggest just staying with the documented Factory Settings method. The power up method would probably be better for folks doing a lot of troubleshooting and who are very experienced with the functionality of their hand controllers. Use this at your own risk.