How to fix this one...

[AtlUmpSteve]

Originally Posted by CecilOne

Yes, "umpire jeopardy". The illegitimate move by that runner or coach had to be corrected. Both should be restricted to the bench.

This is the crux of the issue:
"The run that was walked in was allowed to count, because we didn't see a way of returning a scored run after pitches were thrown."

I guess you were correct about after another pitch; but hopefully another solution exists.

Which rule would you cite in any sanction for restriction rather than an unsportsmanlike ejection in this case? Knowingly and intentionally cheating should never be treated that lightly, in my opinion. Make it hurt as much as you legitimately can to stop that nonsense.