If backwards compatibility needs to be preserved with current behavior of the $1- for the callbackalias, perhaps a better solution would be a new $callbackstring kind of identifier which would contain the normal return3 string.
Yes, I have to say I misunderstood your original second point. It would definitely be good if there were a way (any way!) for the custom alias of a $dllcall() call to obtain the data value returned from the DLL.
