We could introduce the new action and map to ctrl+t, and "go to definition" becomes unbound. If "go to declaration" is essentially the same thing (as of now, until it's fixed) then unbind it too.
If I explicitly use "go to definition" when I'm on a definition, then I probably don't want to go to the declaration but rather see the list of other definitions. Likewise with "go to declaration". This is currently impossible if IIUC?