Well I had suggested a hiatus tag, but that was shot down due to it only being a tempt tag. Which is understandable.

Here I am suggesting a way to filter out manga on hiatus in the advance search.
I think it would be best to create a new little option (section?) considering that some manga on hiatus have a completely scanlated on it, and others don't.
It probably would be easier to just select, "Include on hiatus manga" or "Exclude on hiatus manga" or "Show only manga on hiatus"

-Sidenote Also making this suggestion due to the fact that hiatus manga fall under a gray standard.

Yes yes, I know I make longwinded comments, but that's just me >.<
I should proof read my comments more, but I won't...
So keep in mind I'm filled with typos

Check out FAQ and Forum Rules if you haven't yet.
For errors linking in threads