Ive seen the new empire action where you can produce mulitple of the same structure with a single action. Could you upgrade mulitple structures if they are differing levels or do they need to be the same. Lets say I have a lvl 1 research and a level 2 research, could I upgrade one to 2 and one to three with a 'Upgrade research facilities on planet A (3000) and planet B (4500)? A small thing but when Im rich I might want to do it!!!