vi adding characters by value

[Ryan Burrow]

I've been using busybox vi on an embedded platform and occasionally need to
edit a few bytes to make them non-printable characters, rather than add xxd
to my busybox install I was thinking about adding the functionality similar
to vim that allows ctrl^x followed by 2 hex characters to input a character
by hex value (
http://vim.wikia.com/wiki/Entering_special_characters#By_character_value).
Would this by a beneficial patch to add or am I over-complicating things?

- Ryan
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