Some possibly dumb Q questions

Almost ready to pull the trigger on a Q10, but I have just a couple of questions of current Q owners (I'm assuming these details won't change for the 10). Thanks in advance for indulging. Sorry if these are dumb.

1. If you attach a filter, can you see what the filter is doing through the LCD screen? In other words, if I'm using a circular polarizer, will I be able to get a live view as I twist it?

2. Similarly, for in-camera "effects," do those display in live view?

3. Unrelated, are there reliable, cheap third-party batteries available for the Q?

Thanks again.