The crashes sound like a whole other issue, but please report those in a new thread. I have not found a scenario where this doesn’t work for me. I even tried it on a few of our compatibility machines (Win10, Win8, various GPUs) and it works as expected. Definitely try some older drivers.
You have to lock the camera from the Sequence Editor any time that you are working with it. Just like when you’re outside of simulation. You don’t have to click the Lock Viewport button every time. As long as it is enabled it should work:
In this image, I highlighted the camera cut lock button, but if you select the lock button for the camera itself you can actually make keyable adjustments in the viewport.
I’m imagining your scenario and maybe I’m failing to see how this functionality is a problem. If you make a video demonstrating the issues you’re having, I can put in a feature request. There will not be a fix in newer versions if I can’t enter a clear and concise report.