text: Title: Feature? Pause after deleting abbreviation.
  Body: One of the common issues with expansion is this. When expanding `abc` to `alphabet` often the first letter remains and you get `aalphabet`. I've noticed that actually sometimes what happens is this:
  ```
  aalpabet
  ```
  with the `h` missing (or another letter). So what seems to happen is that autokey sends backspaces to delete the `abc`. However, before the three backspaces have been sent, the keyboard starts typing again, causing the remaing backspace to be mixed with the new letters. I.e., 
  ```
  abc
  ```
  triggers
  ```
  [backspace][backspace][backspace]alphabet
  ```
  but what happens is e.g.
  ```
  [backspace][backspace]alph[backspace]abet
  ```
  
  Question/feature: Is it at all possible to adjust the speed of the insertion? Or insert a pause?
  ```
  [backspace][backspace][backspace][pause]alphabet
  ```
  ?
  
  I guess this could be done via a script... but for the insertion with the keyboard, I guess there's no setting?