A little copy and paste from a comment I wrote on the forum, but I hear that all the important people hang out on the mailing lists so I'll say it here too. I think double click on window title is a bad design, reasons listed below, and therefore shouldn't be default behaviour. - It's confusing for new people and when you do it by mistake. The window just disappears and it might look like the app crashed or terminated. This will be less of an issue if Haiku had some effect like OSX/Compiz that actually shows the window minimizing to deskbar, but a lot of people seem to think that's just unnecessary eye-candy. - It can't be easily undone. For example if an OS had double click for minimize to title (aka shade, which is another horrible mechanic, please don't add it :)) at least you could double click again in the same place to get your window back. - Even if most people will eventually adapt to it, it's still not very user friendly. You have LMB+drag to move window, LMB click to raise, LMB double click to hide, RMB click to lower and Shift+LMB+drag to move tab (maybe there are even some more that I haven't figured out yet.. who knows?). But if people really dislike decorators that much, why not take it to the extreme and remove the zoom and close buttons too! We could set Shift+LMB double click to zoom and MMB to close window. Most people would probably learn to use it after a while, but would it be user friendly? - It's not intuitive. If I'm new to computers there's really no way to remotely guess that the window is going to hide if I double click it's title bar. People will figure this out by a) accident b) trying to maximize the window or c) reading the manual (and nobody reads the manual) but until then they'll just be wondering why you can't minimize windows in Haiku. Some other OS might have dbl click to maximize (zoom) window instead, but there's also a maximize button you can use and if you accidentally do it, and at least it's very easy to figure out what's just happened if your app now covers the entire screen. - Other OS:es have separate buttons for minimize / maximize. Do you think it's *only* because they copy eachother and have legacy UIs to think of, or might there actually be a concious design decision behind this? - The efficiency savings of double clicking the title compared to clicking an icon on the title are microscopic. And you save a few pixels, but if they're so valuable then why is the zoom button there?