I was just thinking about making this myself to use for some things, good job hopefully it is clean enough that it will save me time in the future.
Epic actually is already accepting c++ plugins but they take awhile to go over and haven’t released any of them yet (should be some out with 4.11 soon).
While browsing around before considering starting on it I ran into a few unity version packs that do the same thing and they have text color and emoticon support, you might want to look into that as i’m sure they would be heavily requested optional features.