Change case of selected word

I recently bought your Pro version. Please integrate a method to change the case of a selected word easily. Other keyboards I have used have implemented this feature by allowing the user to select a word and then press the Shift key successively. For example, if a word is currently in lower case by selecting it and then pressing the Shift key once it capitalizes the word, pressing the Shift key a second time makes the selected word all UPPERCASE and by pressing the Shift key a third time returns the word back to lowercase. Please implement this feature as soon as possible because this is a basic feature