I can't think of any cansequences but there's a good chance that you might not have given the dedicated user the sys admin profile therefore I expect that you wouldn't get very far when trying to install the package.
Cheers again for your assurance on this Cathal - The integration went ahead with no issues as far as I can tell. I'd suggest clarifying that sentence in the documentation to avoid confusion for others though!
Thanks for the quick reply, Cathal! In this case the dedicated sync user does have the sys admin profile so I'll try installing the MLM app using these credentials then will report back here on the results :).
I can't think of any cansequences but there's a good chance that you might not have given the dedicated user the sys admin profile therefore I expect that you wouldn't get very far when trying to install the package.