I was tested with the Win10PE SE from below(built with WINDOWS10.0.10240_x64.ISO with default settings.).http://win10se.cwcodes.net/Compressed/
1.) I have NO context menu
Desktop/right click/Display and Control Panel/Display both works for me.
2) PECMD.exe DISP
will set the max resolution.
add this commandline in startup script will make the max resolution for you, which one should be.
4.) I added your WinXHell_x86 program to the ISO. When I execute it after boot I get an application error (see attached snapshot 2)
try run this in cmd.exe with commandline I was written.
WinXShell.exe is a zero dependency shell program(Desktop,Taskbar,TrayArea,Simple StartMenu) for all windows version above XP,
but the Insider Preview Win10 15002~150042 build will crash if running the program directly.
It has a config for avoid this error.
but with -ui option, it won't create the shell, and shouldn't be error, so I didn't show the config for you.
the WinXShell's Resolution Settings will list the vaild Resolution and the max Resolution in the first.
It could auto set the max Resolution if modifing the main.jcfg with some *script* for it,
because the PECMD.exe can do the CUI things, the WinXShell.exe just foucus on a beautiful simple GUI interface.
I saw the application error message :(
the WinXShell is developed in Chinese/Japanese Language OS(tested on Chinese/Japanese/English Language OS),
maybe there something wrong with othe Language OS.
after all, tell us your PE's build version or upload on some server, that we can try to find why it doesn't work.