I suggested this in another thread but thought I would give it a home of it's own.
It would be a lot less annoying for me if Turbine changed the invite notification to chat based rather then a popup in the middle of the screen. Similar to what you get when someone requests to join your LFM.
The tools can then keep spamming away their blind invites and those of us who want to ignore them can do so without getting distracted while playing.
Also means we can right click to squelch if we so want to.