Tab completion is incredibly helpful. I think this is an area where it could be slightly improved.
Currently, the hints provided for flag and the flag negation (--no{paramName}) are the same:
I think having the hint for the negation indicate in some way that it is negating the flag, so that the text is different, would be helpful.
I haven't thought about this too deeply - off the top of my head, one approach might be: (Negate --force flag) - because the flag and its hint will already be showing. Just a thought.
Also, more for my own reference, I think these are the lines that deal with this: https://github.com/Ortus-Solutions/commandbox/blob/8d12ac9b13b7ff95af4cd1f7b5bac7a92785ddc6/src/cfml/system/util/jline/CommandCompletor.cfc#L182