These programs are really useful, I've used several in the past. I would encourage you to add lots of options for varying the colour / presentation of the text, if possible (I see you have outline already). In the past I've taken the output of such programs and edited in photoshop but it would be far quicker and easier to do within the program. Particularly things like gradients of colour across the characters, which is difficult to do externally. You could even add normal map / PBR channels, texturing etc.

Also subpixel rendering like cleartype is really handy, maybe with switching RGB / BGR and parameters if possible.