Heyo,
It is not yet implemented but I have been thinking about it for a while - looks like now is the time to handle it. I am preparing a coded variant of the tanks mini-game tutorial and it would be handy there too.
Created an issue:
Right now there is a way to send params to the trait.new() constructor, but I will rework this like you suggested. That way it will also be clear which values are actually being set, show proper UI type, tweaking variables at runtime…
