tahoe as root! Tahoe-LAFS runs fine as any user with privileges to write to the disk, access the network, etc.
If there are caveats to this, please let me know and document them here!
tahoe start in my crontab for the user under which tahoe is running with the following:
@reboot /path/to/tahoe start
You may need to add the -C command line option if you are running tahoe from a non-standard directory.
pyopenssl or python-openssl depending on your distribution.