BIG MAPS

[DerVVulfman]

I am wondering if you are asking what I think you're asking by way of filler.  By way of a filler map, are you suggesting a map (or maps) that can be randomly generated or replaced as desired?
IF that is the case, no.
┌─────────┬─────────┬─────────┐  ┌─────────┬─────────┬─────────┐ 
│         │         │         │  │         │         │         │ 
│ Fixed   │  Fixed  │  Fixed  │  │  Fixed  │  Fixed  │ Fixed   │ 
│         │         │         │  │         │         │         │ 
│         │         │         │  │         │         │         │ 
├─────────┼─────────┼─────────┤  ├─────────┼─────────┼─────────┤ 
│         │         │         │  │         │         │         │ 
│ Fixed   │  Fixed  │  Fixed  │  │  Fixed  │  Fixed  │ Fixed   │ 
│         │         │         │  │         │         │         │ 
│         │         │         │  │         │         │         │ 
├─────────┼─────────┼─────────┤  └─────────┴─────────┴─────────┘
│         │         │         │
│ Fixed   │  Fixed  │  Fixed  │
│         │         │         │
│         │         │         │
└─────────┴─────────┴─────────┘

All maps are fixed, and cannot be swapped out, randomized nor replaced.   When generating a big map, you not only generate the map as it is drawn within the spriteset class, but it also creates a full complement of every event on every map, and a complement of all wandering monsters if any present.

On top of that, the Teleport Player system had to be augmented to recognize if you were transporting to another point within the big map or if teleporting in/out of a big map and the like.

The application of a filler map, as in a map to take over a temporary spot within the big map list,  is not a feature.