Thank you for noticing that. I don't think it was intentional, however, I've been working on this in spurts for the past couple of months (after loosing one that was complete due to a hard drive crash), and sometimes when I'm more awake than others. That effectively solves the problem I was having (although it was purely a problem with the visual appearance rather than how the dialog actually works).
I'd still be interested in knowing if someone could explain why the drop down list was allocating so much space. Based on some rough calculations, it almost looks like it was allowing space to accomodate an entry for each item in the hash table.
