First u need all Inject Queens in a Group and Select them and put ur Mouse in the middle of ur screen.
[<] is used as Base Camara key to cycle through the hatches.
[y] is used for the Inject selection
[x] is used to click on the hatch
So u select Queens press <yx<yx<yx<yx<yx<yx<yx and u got 7 hatches injected
U can do that in 1 second if u got it down fast.
Essentially i use 3 fingers of my left hand and tab on the keyboard in a way u do when you are waiting and start tapping ur fingers.
This makes it a lot faster then to click with the mouse
If u think this may be a valid and fast method i can go into more detail why i use this spesific keys and how u can do this without !@#$ing up the hotkeys