All of those were incorporated in SOTN, weren't they? Weren't there stairs you could pass through? And the portals required pressing up.
Granted, you should be able to duck while on stairs, which would easily be accomplished by making left/right control stair climbing. But as for jumping onto stairs, I've always hated that mechanic. It's unrealistic. I said it before in my thread: if you try to jump onto a stair, you risk falling backwards and breaking your neck or falling forward and fracturing your shin. With that said, it's not hard to incorporate it into old CV games if you really wanted. As is the case with all "new" game mechanics, it will take people a while to get used to.
An alternative to the doors that I thought of too was, in a linear CV, make the door automatic entry. So say, Trevor would walk towards the door which, up until that point, was set as a background, and then the other frame of the doorway and walls after that are set as foreground, so it looks like he walks into the building. A variation on that for Metroidvanias would be to add stairs inside the doorway, so gamers would know to press up at the door.