I've tried Hipmunk several times because I feel like I should like it, and though I agree it has some great UI elements, I've never found a flight I've wanted t

I've tried Hipmunk several times because I feel like I should like it, and though I agree it has some great UI elements, I've never found a flight I've wanted through it. It just amazes me that it's still so hard to get quick and decent-enough results with semi-ambiguous depart/arrival dates. Though it's not perfect, Adioso.com i would say is the best flight search site I've seen for this (and find myself constantly going back to it because of this particular feature). It very quickly accepts ambiguous search terms, then quickly displays a nice price graph. As soon as I select a depart date, it jumps me to the return date price graph (if it's a return trip), and I'm done. I just tried the price graph feature in Hipmunk, and I set my "outbound date" easily enough, but I can't for the life of me find how to choose my inbound flights?! Edit: I just figured it out. I need to click on the plus to the right of the # of days selection to add +- days to consider. I'm not entirely sure this is intuitive or necessary?