Re: Request feature: about the TTS editing
Doing much pronunciation editing is not a good idea, in my opinion. If you don't like the way the current TTS voice pronounces many words, rather change the voice itself, instead of editing words. There are many French voices that can be downloaded or purchased form Google Play.
In @Voice app there is a better shortcut to go to editing a word in Speech edit - long press a word in the text, then when it gets selected, press the menu button (3 vertical dots) in the popup toolbar, then press "Edit speech" in the menu that appears.