Factorio Forums

W = Running ↑ + S = Not running ↓
S = Running ↓ + W = Running ↑
A = Running ← + D = Running →
D = Running → + A = Not running ←

Visually ↴

You didn't actually make a suggestion. Do you want the green combinations to stop working, or the red combinations to start working. If anything would be to change, I would expect to see the W and S or A and D cancel each other out and no running occur at all.

I believe this has been mentioned in another post, and it was something to do with the keyboard priorities so may even work differently depending on hardware and/or OS.

One option is to not press competing directional keys.

In my opinion, it is obvious from the context what is required of developers.
As for your suggestion, do not press the keys described at the same time. So this is inevitable.
You're not going to stand under a hail of attacks. And when dodging, the keys are often pressed at the same time, even for a moment.
Which gradually shifts the character to one side:
S + W = ↑
or
A + D = →