I haven't implemented UTF-16 support for the "Reverse order" one, so some WingDings characters (and all sitelen pona characters) will break. I'll try and fix it later :p
To-do:
Make multi-character mappings work without a separator - this will enable stuff like the Standard Galactic Alphabet. This probably requires regular expressions... my sworn enemy... and also 2 days of debugging and trying to remember what I typed before </3