CHIRP

I think you're asking to support a new radio model. If so, nothing can be done until a dev has the radio in his hands. See Rules For Loaning A Radio if you have one you are willing to lend.

The Yaesu FT-40 handheld (and its brother, the FT-10) are not on the list of supported radios (see Wiki main page) - but their cousin, the Yaesu FT-50, is! It might be relatively easy to add these two.

If there's still interest, I'd like to give it a shot - if someone's willing to provide a loaner.
Please contact me if you want to provide a sample radio, but review "Rules For Loaning A Radio" first. I'm located in the California Bay Area. Thanks!