Sure, but I think someone could question if most plug-ins are GPL and a few aren’t, what the licence of the unlicensed plug-ins actually is. The two crossfades were added by Dominic originally, so I assume he wrote them, but I don’t know. I’ll ask him if we can include the two comment lines to make the plug-ins GPL.
Clip Fix definitely isn’t GPL, but Ben agreed to have it included in Audacity and let anyone modify or distribute it, without wanting to tie the licence down or make the terms explicit in the plug-in. That isn’t ideal, but I’ve reached him today and he is now very happy to make the plug-in GPL so that anyone can openly work on improving it. I pointed him to the main discussion thread we had on improving it: