The option to turn voice feedback off will be coming in the next update.
HN user
fleksy
Was responding to the second issue: "The second issue is the inefficiency of entering custom words". On that front Fleksy is the same or faster than the standard iOS keyboard.
Getting the exact text as you typed it is just an upward flick away with Fleksy.
Actually, touch typing on Fleksy is faster than on the standard keyboard. We reduced the lag time required to input letters from .5 seconds to .35. Plus, you only need to input those terms once.
There is a solid way to add and remove custom words to the dictionary. You can also import a friend's(or a community's) dictionary.
Fleksy team guy here.
Thanks for the feedback guys, feel free to send anything else you might have for us at feedback@fleksy.com We want to make Fleksy as good as it can possibly be.
@fleksy on twitter.