I am considering using the rootfs for a /boot partition then repartitioning mmcblk0p1 and mmcblk0p2 to each be around 14.5 GB and be used as / and /home/user/MyDocs. / would be formatted as ext3 and /home/user/MyDocs would be formatted as vfat.

I would prefer ext3 for /home/usr/MyDocs or to have all of / including /home/usr/MyDocs as a single partition but I understand that bad things happen if this partition is not vfat.

The partition setup would be

rootfs /boot 256MB
mmcblk0p1 / 14.5 GB
mmcblk0p2 /home/usr/MyDocs 14.5 GB
mmcblk0p2 swap 768 MB

What problems do you see with this setup?

Thanks in advance for any advice.

The main problem will be a slowdown - the eMMC is slower than the rootfs. How much of an impact this'll have I don't know though.

you'd be better off using rootfs for /, and that 14.5 GB partition only for /usr dir... that could decrease the performance hits of using eMMC (and you could e.g. move /usr/bin and/or something from /usr/lib to rootfs)

See my wiki page and post and thread mentioned there. There is a long thread on repartitioning already.