Next suggestion:
Right-click on arrow buttons should mean MAXIMUM/MINIMUM.
Example: on the Research project screen you click on the increase scientists button with the right button of the mouse, and the scientists allocated is set to maximum value, immediately!
Or you click on decrease scientists button with the right button of the mouse, and the scientists allocated is set to 0, immediately!
Imagine this function on the Research Project screen, Manufacture allocation screen (count of engineers, pieces to produce), Craft Equipments screen, Transfer items screen, Buy/Hire screen, Sell/Sack screen!
Yes, I've done it (all of these) again!
You can find it in the development section,
HERE.