I could do a pooling system, or even provide ours as an example in the private support area. I have no problems with that. I will think about integrating it into the toolkit in more detail later and make up my mind then. My immediate thoughts are it should be as separate as possible so it can be used in other scenarios too, which is why I'm trying to persuade you to do the other alternative. That pooling system you linked to is more like what we have for our own stuff, though we wrote ours ages ago before this was released.
My main target now is to get a beta of the tilemap editor released, was planning on today, but a few more features need to be done before its released - collider mesh generation needs to be optimized, layers interface is not there yet (a slider to select current layer isn't really cool) and prefab spawning. I will definitely release a snapshot this weekend - at least if I can get some early feedback for the ready bits, then that would be really good.
@amaranth - It is too late to integrate any new features to the first release, but I will certainly look at this autotile stuff with more detail. Currently the system lets you drag and draw 3 or 3x3 tiles to a rectangle of any dimensions, but can't handle the joins between islands, which you will have to fill out yourself. As I mentioned, I need to get it out first, and then worry about adding more features! Thanks for the suggestion - I was thinking of how to automate this, but now that there is a "standard" of sorts, perhaps I could use the same format of tiles.