Yes, script settings are fairly flexible, and documented in §19.7, Creating Your Own Script Formats. You might also want to try a few of the alternative built-in script designs, before settling on a starting point from which to customise. The stage play designs, for example, are better suited towards longer sequences of dialogue in my opinion. Given the format you might even find the Comic project template to be a better start.
Is it possible(somehow) to auto-keep a list or even auto-create personal pages for styled and/or taged characters, items, sounds etc?
Could Scrivener auto-correct them in script if i change them in lists? (optional)
The idea is - i need to track i.e. sound effects during scriptwriting to give that list to sound composer later. I would like to exclude a need to oversee a script each time to find sfx, and occasionally miss some.
I wouldn’t phrase it as automatic (and I’m not entirely sure what a “styled” or “tagged” item is), but you can surely set up boilerplates to easily fill out sheets like this. We call them “document templates”, which have a quick 5-minute how-to in the interactive tutorial (look under Going Further: Customising Projects). A number of the fiction-oriented project templates have example settings already wired up for you.
To anticipate what you might mean by “tagged”, try going into the Corrections preference pane, and enable Automatically detect [[document links]]. With that on, you can type in the significant noun with brackets around it. If a sheet already exists for that noun, it will simply link (and by default, open it for your reference) and you continue writing. If it is a new noun you’ll be asked where to create the new file to link to. Designate your character sheets folder, and you’ll get a new sheet on the fly. That’s about as “automatic” as it gets in Scrivener.
With sounds, you could actually import the effect into your binder and link to it (drag and drop into the editor works for linking, too). Might be nice to have the ability to verify the sound complements the mood you’re writing toward—and having a folder of sounds in a list is something you can select in the binder and copy and paste into a text editor as a list.
No, it’s an auto-completion system that aids in typing. It isn’t a formal list of objects like you might be thinking of them. Once you insert the letters of the alphabet into the editor, that is all they are.
There is however a global search and replace tool, for such cases as these: Edit ▸ Find ▸ Project Replace….