TL;DR
Possibility to use the each signal either on the right or the left side of the operator in the Arithmetic Combinator.What ?
For some operators it matters, if the each signal is on the left or the right side of the operator.For example in division (/), subtraction (-), modulo (%), power (^), bitshift (<<, >>).
Here it would be good, if you could use the each signal on either of the sides for more complex Combinator Setups.

Where the each signal could be

Why ?
I tried to put a kind of multiplexor for a lot of binary numbers together and I came across the situation, where the best thing would be to shift 1 for each input signal the count of the input signals to the right.Also it seams for me to be more consistent to allow the usage of the each signal on the right side of the combinator as well.