Hence the little 2 pixels line between the conditions, in opposition with direct touching events as it is now.
For having discussed with Ashley on IRC about "else" and "or" events, it appears they are tricky to implement, and that's why they've been postponed for now.
So eventually they will come, and indeed for now a "or" condition is pretty tricky to implement with an event workaround.
As far as I'm concerned, I've tried as much as possible to avoid having to have to use a "or" event with the organising of the code and the logic used.
Apparently, such a 'visual' division isn't as intuitive as you thought cow_trix, judging by Spades' answer ^^
I also feel a "or" condition as it is in CC would work nicer.
EDIT: 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.