Re-generate just one letter

I'm playing around with the new Text Effect tool in Firefly which is amazing, well done! But when I type a word that uses the same letter the pattern in that letter is the same and look repeatative. It woud be a great idea if you can change the look of individual letters as a word around. Also you may like 3 letters the way they look but want to refine others, this idea would also help with this.

It would be great to be able to lock the effect on a particular letter and recreate the rest of the letters

What would be nice is a function/a button which enables different variation for the same letter (for example coffee). Its extremly obvious and weird looking that in that example the ff and the ee looks the exact same. 

Also when I typed in "liquid coffee" it still used beans btw

IT would be great if I could select a singe letter and regeneret that one, if all the other once are good. 

With text effects, sometimes I really like how one or two of the letters look in a word but not all of them. I find there can be a lot of variation in style for each letter within the same word generation. It would be great to select the "approved" letters individually and then regenerate the other letters to look more similar to the "approved" letters. Or at least the ability to only refresh or regerate some letters in the word while keeping the ones you like. Or even just choosing/approving one letter as a baseline for how the other letters should look so they can regenerate to try to get closer to the style of that one letter.