I may be missing something and in no way mean to criticise crews doing a real time real life job...
Why would you not just drop the gear when winching anyway?
The performance penalty at hoisting speeds must be negligible at best, and the benefits of being able to just "lob it on" if you have to are considerable.
Does gear deployment compromise float deployment on the 139?
To me any system that allows you to inhibit gear warnings is facilitating a potential gear up landing
OH