IL request and message

Has is ever been consider to making it possible to add comment or some sort of text when requesting an interline agreement?
It would be nice to either write some comment on why you ask for IL, or know why someone ask you for an IL. Without having to write a separate private message

I don’t know if this was already considered before but I would assume that this feature would be much too complex to programm and as you have also written - sending a pm is the solution which is already there.