I think before eventually landing D19310 and with D9117 in mind it makes sense to think about the current shortcuts and eventually new shortcuts because with D19310 we would get the migration to new defaults for free. Currently spectacle exposes one shortcut for launching plus three: active window, full-screen, and rectangular Region. D9117 adds three more (the copy variants). Also there is the possibility to expose an additional Action taking a screenshot of the current screen only.
|Fullscreen||Shift + Print|
|Active Window||Meta + Print||Alt + Print|
|Rectangular Region||Meta + Shift +Print|
|Fullscreen+ Copy||Ctrl + Shift + Print|
|Active Window + Copy||Ctrl + Meta + Print|
|Rectangular Region + Copy||Ctrl + Print|