Tested it with the standard screenset which has the slider, as opposed to the buttons I use on mine, and yes it screws up if you slide too fast. This is strange as I have used a pot and can wind fast and it seems to act fine. I dont have my pendant here as I have dismantled it to make a new front plate but will see if I can temporarily cobble it back together to test out tomorrow and see if it does indeed work like I am remembering.
I have also done another test which is to enter the FRO % direct into the DRO and that seems to sort of work, it will work if you slowly enter decreasing values but will stop if you jump too quick but seems not to screw up totally like the slider is doing.
Seems like there may be a couple of issues on the go here, one is definitely a problem with the SS and one could be with Mach.
There are big changes coming online shortly in Mach and this should make integrating external devices such as the SS much easier and cleaner. I cant talk for Greg but I suspect you probably wont get any action on the plugin until then as any work done now will have to be redone with the newer version, so it would be a lot of effort for a short term fix. Timescale for the new Mach is in the next month or so but that could vary depending on whether things proceed to plan.
If you are wanting to use FRO it may be a good idea to remove the slider and add up/down buttons to a screen and you shouldnt have the missing step errors, I certainly dont seem to have them anyway. You will however get the FRO stopping motion once you get down a bit but even resetting direct to 100% seems to be fine and it seems to observe the accel.
Hood