Here is a suggestion I just had pop-up into my head. Not sure if it is possible, but it could really improve the
workflow.
I've been doing a lot of levels with the Tileset Editor using a Palette layer for a custom palette to quickly grab the
tiles I need (like you suggested to do, which works really well!). Like this :
Everything works well, except the switch to the right layer to grab the right tile is kind of a little bottleneck. If
the scene is complex enough, it can become more of a drag. You need to keep clicking on the right arrow box to select,
then go back to the right layer. Bit like this [this is a GIF file so might take time to play the animation]
So this got me thinking. Why not do like the Layer system in Photoshop. When you have a very large PSD file, it's really
ideal to just crtl + left click to get the right layer instantly. It basically selects the layer with the top most
Pixel... think it could maybe be done in the editor?
Here's a GIF mockup of how Crtl + left click would speed things up (again can take time to play the animation) :
Crtl + Left click to grab the appropriate layer, and right click to grab the right tile(which we already have) would be
heaven. Hehehe. Hope this could be something that happens.
Also, this would be a very quick way to see what is in which tile. Say you have a lot of tiles, instead of doing hide/unhide to all the tiles, which can take long, you can just crtl + left click to quickly see what corresponds to which layer. Just to make the Tileset editor even more awesome.