@dj_steve:

Permissions for /system/app is: rwxr-xr-x (AKA all permissions)
Permissions for /data is: rwxr-xr-x (AKA all permissions)

And I can install apps. Someone who cant should probably check their permissions. I managed to install a thing by downloading a .apk file in the internal browser and just click it.

EDIT: The touch screen driver seems a little buggy, when you reach the outer areas of the screen the calibration seems off, but in the middle it's ok. Check it out yourself, open Dev tools and select Pointer Location.