Found it! in RuntimeMenuItem.cpp
I added a space and en extra '.' to the start of the array and it is working great!
const char ALLOWABLE_EDIT_CHARACTERS[] PROGMEM = " .0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!\"$%^&*()_-+=@';:#{/?\\|,.<>#{}~";