I see you have a 2nd device under development, and I'd like to suggest a feature for it. How about adding crypto hardware?
It'd be great with acceleration for things like encrypted FTP, SFTP, even HTTPS downloads I guess

There is for example this framework called OCF-Linux (http://ocf-linux.sourceforge.net/) which could be helpful. According to their benchmarks, bulk crypto throughput is 7 times that of software crypto.
One of the supported processors:
http://www.hifn.com/uploadedFiles/Libra ... 956_v2.pdf
If you are planning on adding WLAN support for upcoming revisions of Bubba, they most likely already have a IPSec core, which could be utilized for general purpose encryption.