I'm now using dev-tex/dot2texi instead of the texlive bundled one, I dropped your keywords on texlive-pictures too so that you don't temporarily lose a package.
Marked ~hppa.
prefix done
~arm added.
~ppc/~ppc64 done
~alpha/~ia64/~s390/~sh/~sparc done
Added ~mips.
Added ~x86-fbsd. Closing.