Both Radeon and NVidea have workarounds as you suggest for the fullscreen mode. But I point out the following advantages to wsgf.org widescreen use.
The difference of 1024x768 and 1600x900 is:
-156% horzizontal view of the terrain map
-plus 117% verticle view of the terrain map
--about 182% more of the terrain map is viewable while playing
Drawbacks are you need a HD monitor over 30 inches to get a decent play experience, The Empire Map gets smallish & some of the menues and borders may not be perfectly aesthetically pleasing as the original.
I understand, both widescreen and the original Poseidon 2.1 now have Pecunia's fix/patch, though I have not verified by playing both versions.
Poseidon's Editor is part of the Zeus.exe so there are not designer issues as with EmperorEdit.exe, though some designers may take issue with the aesthetic borders and menuing. Shrug, cant please everyone, and designers may want to use the original for playtesting to avoid any weirdness for standard players.
Whichever works for you is great. I posted in Emperor Forum how I setup
multiple installs to have a variety of game experiences(original, widescreen and mods). But not everyone reads/understand their EULA or has multiple copies of games.[This message has been edited by user3 (edited 09-23-2019 @ 02:47 PM).]