Dear Christian,
In PocketPC design most of the application can hardcode or configure from an editor some shortcuts to assign to your buttons.
In essence each of the buttons you have on the field are assigned an action. This same button with an action can define some pocketPC shortcuts.
In my example below, I have a screen called CycleCountTileListPPC. This is the name of my screen that has buttons defined with their corresponding action.
As soon as you see the detail screen and the buttons select the buttons you want to modify and assign shortcuts on your application.
In my example below, I chose my button "Get" which is assign an action FetchPhysicalCounts. I am going to assign a pocket PC hardcode shortcuts to it. It can be CTRL, Alt or Shift + any numbers or buttons that I specify in the drop down (see picture below). Enter is a special key so you Cannot use the enter key. Enter key is tied to OK or acknowledging an entry.
Some limitation is using the Left key or Right key to traverse between screens. Sometimes your action has multiple transactions that uses different screens. So the left or right key (hard key) may have issues if you do that as you cannot go back to the transactions once you left it.
Hope this helps you out.
Best Regards,
Mark Pe
SAP Senior Support Engineer (mobility)