1) Copy vim binary to /mnt/bin/ (or any other location from PATH variable)
2) Remove vi and vim from /mnt/bin/
3) Make a symbolic link to vim (ln -s /mnt/bin/vim /mnt/bin/vi)
4) Copy vim directory from vim_data to some usb disk (to save space on the device) or any other location.
5) Make a symbolic link from /dtv/ to your copied directory. For me it was ln -s /dtv/usb/sda1/vim /dtv/vim
6) Remove (or comment out) line "echo "alias vi='busy box vi'" >> /dtv/.ashrc " from /mnt/etc/rc.sysinit
7) Put in the same place "ln -s /dtv/usb/sda1/vim /dtv/vim" (adjust it to your configuration )
8) Just below put the line: echo "TERM=\"xterm\"" >> /dtv/.ashrc
9) Unpack attached vimrc and move to /mtd_wiselink/.vimrc
After that you will have working vim with full color syntax highlighting
http://www.sendspace.com/file/4mnlr4