We didn't include minimize/maximize buttons by design reasons. Removing them we can use a smaller title bar, which is a benefit on single monitor environments. Also the Style Editor is closed automatically when the RailClone object is deselected, so usually it's not necessary to minimize the window.
Regarding the final version, we have plans to release it in the next weeks (there is not a date yet). But really there are not "stable" versions, because once that most of users move to the new version and test it, some bug may appear, and therefore we have to release new patches.