It is also not documented on help page "Dialog box: Configuration - Change button bar"
Actually ZIPFROMLIST is mentioned in the Help - as command type 5 - the paragraph just does not start with ZIPTOLIST - so it is easy to overlook.
I checked back in time - ZIPFROMLIST is mentioned in the help for TC 4.03 and the parameters for ZIPFROMFILE is mentioned fraom TV 8.50 b1
ZIPFROMLIST is now capitalized in TC 10 b2 - so it easier to spot.
If you mean parameter -10 is not documenetd - then you are right.