With some recipes, it seems like having loaders wait for full stacks means the building will get stuck on "Output Full". Is there anything that can be done about that? It rather puts a damper on using this mod, as many recipes are incompatible with this feature, especially as the stacking level increases.
I recommend Stacking Loaders to solve that issue, so you can set a custom stack size. Either that or inserter->chest->loader.
As an aside, I've noticed that the Undoing doesn't work when you place loaders that make full stacks. You can use Undo to replace a loader you've deconstructed and it'll rebuild in the opposite mode it used to be in, but if you build a loader that automatically goes into Full Stacks mode, Undo won't even notice you built that loader.
Known issue, a lot of things surrounding ghosts don't work properly right now.