I've never tried those combinations. I'll try them and get back to you. Thanks.
I was hoping for a way to modify the key behavior. Is that unavailable?
I am pretty sure you can't change that.
The player controls perform one single action, and I feel that they should.
You are pretty much asking it to perform a sequence of two actions.
And even it it could be done, it wouldn't save you a single keystroke compared to what I suggested.
[Stop]-[Play] vs. [Previous]-[Play]
[Stop]-[Next] vs. [Next]-[Play]
Perhaps you could achieve something more to your liking using AHK? (AutoHotKey)
But I really don't see any practical advantage.