Let's say we'd get more skills - How would you handle them?

[Reynhart]

In the end, we only used 4 keybind, A,B,C,D to to 5 different combo with a grand total of 12 different animation and effects.

For me, it could be a problem to see exactly where you are in a combo chain.

The easiest solution would to put each combo on a single key. So, for PLD :
1>2>3 would be 1>1>1
1>4>5 would be 2>2>2
1>2>6 would be 3>3>3.