Well first you should probably add a symbolic link to bmk to your ~/bin directory.
Like so: ln -s /path/to/bmax/bin/bmk ~/bin/bmk
I don't know that Macs allow a per-user bin directory, but my Linux install does, and I'd assume you're able to add a user bin to the PATH. If you just want to modify the PATH, then you'd just do something like this:
export PATH="$PATH":/path/to/bmax/bin
Then you should be able to execute bmk from any directory (until you close the terminal).
Beyond that, I can't help much, since I no longer have my Mac. Worse comes to worst, I'd try the IDE even if it is downright evil.
Like so: ln -s /path/to/bmax/bin/bmk ~/bin/bmk
I don't know that Macs allow a per-user bin directory, but my Linux install does, and I'd assume you're able to add a user bin to the PATH. If you just want to modify the PATH, then you'd just do something like this:
export PATH="$PATH":/path/to/bmax/bin
Then you should be able to execute bmk from any directory (until you close the terminal).
Beyond that, I can't help much, since I no longer have my Mac. Worse comes to worst, I'd try the IDE even if it is downright evil.