Jeff, did you get it sorted? I have written a couple of Brains for FRO, SRO and they do a feedhold when the Feedrate gets below 1% I think then automatically starts again when you wind it back up. Also have a Brain that will reset to 100% when within a few % either side of 100%, this is needed as the analogue signal will vary very slightly and if Mach sees 100.01% or 99.99% the FRO LED will flash. The Brain stops that happening.
I have not used them that much as the pendant is in bits at the moment awaiting me getting it rebuilt properly but it did seem to work fine when I was using it.
Heres a link to the thread with the Brains, use with caution as although it works fine for me it may not for you..
http://www.machsupport.com/forum/index.php/topic,9632.0.htmlHood