Okay, I don't really want to derail the topic further, but I guess I need to explain what the heck it is I am trying to say.
You have a tileset for a forest. You have it set as tileset 1, you name it FOREST. It uses A1, A2, A3, A4, A5, B, C, D, E Cool!
You're making your forest, setting each map to use tileset FOREST. Cool! You get to the last map and you want a big house on this map and you don't have room for your house left on your tilesheets. Well! Not cool. But wait! That map doesn't use anything from sheet E. Well, we're cool again.
You make a NEW sheet E. And then you make a new tileset, tileset #2. you name it FOREST-special or FOREST-house or some name. You set tileset #2's 'E' sheet to be this new E sheet you made. Now you set the final map of your forest to use tileset FOREST-house instead of just plain old FOREST. VOILA! You have surpassed the limitations you thought were there.
Better yet, you can put more things on this E to use for special maps such as this. In the end, it's less files and less bloat then going 'ah dang, guess I'd better parallax everything now.' EDIT I mean, you put the whole house on E. I know you can't use E to replicate the way you would normally make houses. Or heck, maybe you don't need some of the junk you have on A3 on this map and you can totally build the house from scratch if you want and have a special A3 to use on special maps. Whichever. Or like, you could not even make a new tilesheet and just set your town B as your special forest E and save even more time and space. Since, as this was a poor example, the chances of using up all the space on A3 is rather improbable. Especially in a forest.
This is what I am talking about when I say make a new tilset and swap out the A1 through E as need be.
Now I say nothing more on the matter because that's not the point of this thread. If I'm still not making sense, feel free to PM me. @.@ But I tried to be clear.
@Zoltor: Yes, that was a misunderstanding that was cleared up last page.