Taras,
That was my original plan as well, but managing and deploying dozens of little packages that are all under active development is a nightmare even with devtools. Just too much overhead, not to mention that coming up with names that would not have namespace conflicts was getting silly.
i can imagine.
In the end, I wrote a package that implements lightweight python-like modules for R and that has really improved my workflow. I hope to publish this package later this year after I have cleaned it up a bit.
cool -- good luck with it. Greg