As I mentioned, when you pass values to identifiers they're tokenized by commas, not spaces. In that case, spaces are not yet messed with. spaces.dll takes data via identifiers so spaces aren't touched and then bypasses tokenization when sending this data to commands. mIRC would need a similar construct to denote that spaces need to be ignored during tokenization for a part of or all of a command. I suggested quotes, but it could be done with some builtin identifier syntax like $sp(a <space> <space> ... b) so as to not change the grammar, theoretically anyway.
Not sure about the name $sp(), but I love the concept and think it would work well!
