Is it possible to switch and keep uncommitted changes?

Say I am working on some code, but I haven't gotten far enough to commit. Would it be possible for bzr-colo to save those changes in the respective branch when I switch? This would make my workflow many times easier and would increase my usage of branches tenfold. Right now, to branch, I also need to replicate databases, environments, certain misimported packages would fail, etc.

With colocated branches this is much easier, as I can create a new branch on-the-fly and come back to my original one for a quick fix, but right now I either have to commit my changes to the branch, shelve them (along with others I might have shelved) and reapply in the same order back, or live with them and cherry-pick files to commit.

Would it be possible for bzr-colo to save my changed files in a temporary directory and restore them when I switch back, or at the very least add per-branch shelving functionality (actually, is this possible now)?

Thanks.