sure, but it was you who suggested them to use while they are no different from the standard "command line+arguments" in principle ;-)
+ you don't provide support for the relative path of url protocol (at the moment) which makes it not very useful.
It would be nice if dropping an item from another ur file below its directory structure creates relative path (optionally), just like the normal file does ...
still, this whole discussion ... I don't know ... the simplest would be if UR parses the parameters and calls the right application ;-)