BTW I'm not sure that "locked rail" design is really good most users are likely to be used to this feature from Windows 7 and as such will expect it to behave as such and dragging a window "on a rail" like this really isn't useful anyhow. If someone wants the ability to have a window that is the entire height of the screen but only some of it's weight it's best to implement a seperate shortcut to do this. (Windows 7 uses double click on top/bottom edge)
BTW I'm not sure that "locked rail" design is really good most users are likely to be used to this feature from Windows 7 and as such will expect it to behave as such and dragging a window "on a rail" like this really isn't useful anyhow. If someone wants the ability to have a window that is the entire height of the screen but only some of it's weight it's best to implement a seperate shortcut to do this. (Windows 7 uses double click on top/bottom edge)