Hmm. I see your point but the columns chosen is something that is stored client side and it needs to tell the server this list. If I use the `_columns=one&_columns=two&_columns=three` form I'm going to have to stop using GET at some point because of the maxlength which sucks. 

However, I think what I'll do is change from `_columns` to just `c`. Then I'll look like this:  `c=one&c=two&c=three`