Another feature we've incorporated into the engine/game is Mega Man 2's capability to have maze loops (Like Flash Man stage in Rock Man 2 - Grayzone, to name a few). Hacks proved that they were possible, but the official games never featured them, strangely enough. I wonder if they were aware that they could do them.
Here's an example of a maze loop if you guys are confused.
http://www.youtube.com/watch?v=h7jTLiyQrZYWe constantly are experimenting with things that were never featured in the Mega Man games, but of course keeping with what was possible on the NES and the Mega Man's games original engines. Hacks are a nice source for these as it shows via the rom that new things are possible on a NES Mega Man game. Mega Man games are constantly adding new things, mm5 added reverse gravity, mm6 multiple boss rooms, mm9 added the rotating platform in Tornado Man's stage and the gravity well that slowly floats you up in the wily stages.
They are always adding new gimmicks yet keeping with the limitations with what the NES Mega Man platform engine was capable of. Some hacks have shown that gravity can be easily tweaked in Mega Man games, so you can also have low and high gravity in different rooms, not just the usual low one you have in water and space. (Something we have in our engine now too.)