Supposedly there is a new, eco-friendly, highly-selective methylating agent called dimethylcarbonate (DMC) that will make methylethers of aliphatic alcohols under the right conditions. The article says that aromatic amines (anilines) are mono-methylated, but makes no mention of aliphatic amines. It's probably worth digging up the article, anyway. I should be near a research university library sometime next week, if this sounds interesting. For more information, see the link below.
http://cires.colorado.edu/env_prog/chemrawn/abstracts/Memoli.html (http://cires.colorado.edu/env_prog/chemrawn/abstracts/Memoli.html)
Even if DMC does N-mono-methylate BOB DOB, one would in all likelihood still end up with a very potent compound, right?