Hello Thomas,
You could look at something like X-Keys which can be used to send in combinations of keystrokes to trigger operating system menus. Hauptwerk doesn't have any way to interact with an operating system function for changing screen resolutions.
If you do a search on the forum you should be able to find some posts regarding using X-Keys for accomplishing this if I recall correctly. While it does involve user participation it can be much faster than using the native operating system functions.
We do have console screen resizing enhancements planned for future versions of Hauptwerk which should also help in this area. In Hauptwerk 3 this is not possible however.