The IMC is a National Rating therefore it has nothing to do with EASA
True
If the CAA choose to put it on an EASA licence that is up to them, but it doesn't make it an EASA rating
The CAA
cannot choose to put an IMC rating on an EASA Licence - only
EASA Ratings can be contained on an EASA Licence - hence the IR(R).
It may not be advisable but it is not disallowed.
Yes it is.
When I find the refrence I will post it.
If I can't find it I will apologise.