I just added some character descriptions to the OP. I hate bumping threads like this, so for my future reference: Is merely editing a post enough to push the thread to the top, or is a manual bump required?
A map tile size of 64 would be hard to pull off. One it's hard to find resources for that size, two it's harder to draw (well by pixel art). But if you are going for a more HD style, then you just need someone who knows photoshop well enough.
So yeah, this would probably work better if I use the standard 320x240 resolution (fullscreen would be an issue though since no graphics hardware supports that res anymore
but I do know the official version runs its own update loop, including calls to RenderMap() and UpdateMapEngine().
The rationale was that it was supposed to be a cutscene manager, rather than a map engine wrapper, and I think that's what you really wanted with your Scenario - a map engine wrapper.