AE Button Plus will allow the mapping of the start menu/ok keys
As for the second request, Here are the steps
1. Open AE Button Plus
2. Tap on "Button 5" NOT "App Button 5", or "Button 5 (Press & hold)"
3. Tap the gray area on the bottom 1/2 of the screen
4. In the 1st drop down box select "Handle by AEBPlus"
5. In the 2nd drop down box select "Single Press"
6. In the 3rd drop down box select "Run Program"
7. Tap on the ... on the right of the screen
8. Navigate to \Program Files\TFloCube\ and select TFloCubeCtrl.exe, and tap OK
9. In the Option parameters box type "open" with the quotation marks
10. Tap OK
11. Tap File -> Save and Exit.
12. Test it out.