Off topic a little as i might be miss understanding the subject :
The most annoying thing for me is these small screens when has 1366 x 768 (and called HD), there is clients want their applications to be
GUI designed and running in usable way on these small screen, so naturally i do testing for small and big screen even when i have only one 23 inch screen have Full HD at 1920 x 1080, and want to share with you how to do it in easy way:
1) Create another Windows User, in my case it is "TesterKas"
2) Allow RDP for that TesterKas.
3) Connect to it using RDP from you current user.
4) Go crazy with standard and non standard screen sizes and scaling, using RDP settings and TesterKas Settings.
This simplify the testing a lot and remove the need for another PC/laptop or screen.