No problem. I have other great ideas that address some of the old problems in the original.Layering issue
In smbx, you had two types of layer systems: the one you make yourself and the broken everything on top of everything, background objects went first and had two to three layers: way back, middle, and foreground. Your blocks went in front of those and water went in between. warps fell on top of the water. You essentially had a layer cake. When it came to deleting blocks you had to be especially careful as you could delete everything in one click. You can essentially ruin you're whole level in one click. Unless you want to make 40+ layers for every single object (which can slow down your level considerably); there has to be a better way.
My solution to this beings me back to my RPGMaker 2003 days.
In rpgmaker, you have 3 groups/layers: Lower, upper, and events indicated by the colored boxes in the buttons on the toolbar.
Lower (green) would be what you could walk on or interact with directly. Upper (blue) would be environment and extra terrain. Event (tan) is the far most right square in the layer toggles these are npcs and other things you interact with by an action button (or can be unassigned objects for an extra third layer).
I propose something similar for Nsmbx. Backgrounds, water tiles; water, gravity, and npc pathing boundaries; warps, blocks, and NPCs which can be further compartmentalized by the original custom layer feature in SMBX. This way you can't accidentally delete certain stuff on the same layer. So layer 1 will be separated as so and layer 2 and so on. Hitting a grouping's toggle layer button (the square check box) will make all water or all warps disappear on a layer by layer basis, or individually by object type within each layer.
Possible Menu for new layer system:
Layers +-+-+-+-+-+- [-][□][x]
- Default Layer
 Refresh Destroyable blocks (might be a button on toolbar instead)
 Refresh NPCs (might be a button on toolbar instead)
- New Layer
+ New layer 2Zoom feature
Useful on a world map mode only (see screen of rpgmaker 2003) 1/1, 1/2, 1/4, 1/8 are the zoom buttons. 100%, 50%, 25% and 12.5% basically, the smaller the fraction clicked, the farther out you zoom. I think in Nsmbx we should have a much better zoom than only 4 settings. Maybe a slider akin to Office programs?