So...
There IS a portable version of LMMS on this site, but the current version is 0.4.4, and as of 3/12/12, the latest version is 0.4.13. If you guys could update it, I would be very greatful. 
Thanks!
LMMS Portable LATEST VERSION 
New: Supermium (Apr 11, 2024), Platform 29.4 (Apr 10, 2024)
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Not sure you'll get anywhere, but try posting an update request in that thread as well.