It might be good to add a button that will delete text ahead of the cursor. The language button could be removed to add this:
View attachment 3485
A long click of the backspace or forward delete button could also have the additional functionality of clearing all the text behind or in front of the cursor.
This is exactly in our to do list. Put the cursor some place (by touch or keys) and long push of the < or > will delete forward or backward. It is way down in our to do list though.
For now we plan to release the existing version that the four smart buttons hold the last four entered texts.