Chisum:
-Commands.cfg contains the definition of what each key does. I guess that my mod would still work without it, but you would need to be carfeul not to use a key-combo to lock/unlcok TDC, because it would unsync it.
-Cameras.dat is essential for the mod, but it won't break anything from other mods. You might at most get some views that go through objects when pivoting around.
-de_menu.txt only makes some small changes in terminology. It is not essential, though you could get a confusing lettering in some dial in the F6 screen if not using it. Not a big dial if you are already used to them and know what each one means (Plus you will now only rarely operate the dials from that station). Besides, it will only be relevant if you are using german language in the in-game texts. Otherwise you won't notice it at all.
-OfficerA.tga is the new icons of the left bottom part of the menu bar which are also shortcuts to stations. They are entirely cosmetic and you can safely not use them. In this case you get a warning because they are overwriting a custom one you had enabled before via JGSME.
In conclussion:
If you want to prevent most conflicts, you can delete following files from the mod BEFORE enabling it. Go to the JSGME "Mods" folder and there you can delete any of these files:
Hitman_GUI_GWX3_1.0\Data\Cfg\commands_en.cfg
Hitman_GUI_GWX3_1.0\Data\Menu\de_menu.txt
Hitman_GUI_GWX3_1.0\Data\Menu\Gui\Layout\OfficerA. tga
Once you have deleted those files that you don't want, enable the mod. Good hunting
