We have that option available, it just isn't in the option screen yet. You can manually switch to the method you want by opening the settings file in "C:\Users\Blair\AppData\Local\sins2_pre_alpha\settings\settings.json" with notepad or something similar.
Change
"camera.is_zoom_to_cursor_enabled": true,"
to
"camera.is_zoom_to_cursor_enabled": false,
We'll make it available in-game at some point down the road.