Pardon if I'm misinterpreting how the offline symbol table works, but I assume that the Id field "OwnerId" in just about any given SObject should be declared like so:
global Id OwnerId; global User Owner;
however, what I'm seeing (for at least Account):
This results in failed syntax highlighting and autocomplete (this one is for lead, hence the custom Account__r relationship):
Ultimately, it's not a huge deal, but it does reduce the automatic-ness of IC.