Hi,
In battle I often find myself using the same skill about 90% of the time.
To allow the player to use the keyboard less during battles I would propose mapping the right mouse key to the 1st skill.
Alternatively, the player could right click a certain skill which would then be the default “right click skill” for that character. This would be useful in fringe cases like the archers’ precise shot ability but would probably require more coding work.
I believe either one of those alternatives would improve gameplay using the mouse only tremendously, and would require relatively little work (just guessing, I don’t know how your code).
.