
1. Is it possible that render not to override on the previous one, but add next number when we are rendering single frame to the file?
2. Could we render to the file, but with additional showing render in the standard frame?
3. Z-buffer – how to extend area between dof target and completely blur area? I have rapid change between sharp area and blur one.
4. Z-buffer – is it possible to create only render Z-buffer mask without final rendering RGB?
I hope you understood even half of it, because of my rough English

If not please let me know I try to explain what I meant.
Be grateful for some help.
Qba