I won't be adding it because:
-Each version of the game will have different offsets
-Each translation of the game will have different offsets
-Each and every version that we know of that's on steam can't be hex edited with out removing the copy protection/packing from the binary
One thing you could do is release a patch and state with language/version of the game it works with.
Additionally I'm still toying with API hook dll's for the game. It might be possible to add your own messages that way, no idea at the moment though
If it did work you'd just specify message ID's higher than what the game has used. But you'd also need your own messages.dat / hook dll too.
If for some reason I do this and it works, it will likely only work with certain versions of the game too.