DSM-G600, DNS-3xx and NSA-220 Hack Forum

I fired up my DSM-G600, got most basic stuff working, but am still getting spun up.  It looks like the default shell has /usr/local/bin in the path, which is handy as I can put a line into my fun-plug to symlink /mnt/HD_a2/local to /usr/local, then put my personal apps on the open server side.  rsync and ssh now work cleanly off boot, so things  appear to be loosely functional.

Big question, Is there an editor somewhere?!  I tried vi, which returns "applet not found" (but much other busybox stuff apears to be working).  Am I missing something here?  Anyone out there tell me how to fire up vi, emacs, pico, nano or some other basic text-editor for this thing?

As an aside... Is the only way to get non-root users installed is to re-insert the lines of note into /etc/shadow and /etc/passwd at boot?  Looks like I should need to build a fairly healthy fun-plugfull of cats, echos and links to get a working environment?