DIT: Coming to re-read the whole, I understand the shade you mean by "A bit like".
In fact, instead of having event 1 "Key D is down, do this" and event 2 "Key A is down, do this same thing" they would act as "parralel" events, sharing the same actions.
In this case then yes, your suggestion works and would be a nice addition indeed.
Especialy if it is counted as a single event.
Signed