You can change apps order in drawer, move to trash unused ones and add Your app.
How to change apps order
How to move to trash unused app
Drag the app below “Not used apps” header
How to move to add custom app
Click “ADD YOUR APP” and implement commands.
For example if You use Impress.js You can emulate arrows on Your keyboard for implement previous and next command.
previous for Impress.js
tell application "System Events" to key code 123
next for Impress.js
tell application "System Events" to key code 124
Have You created interesting configuration? leave it in a comment.
Are You waiting for sample configurations? Yep. I will post samples on the blog.