Based on my understanding, in your component edit dialog, there are so many multi fields and you want to filter those and if you expect that the items which are in multi fields grow then it is good that logically re-organize those by creating separate tabs. there are no filters in AEM but you can wr...

Please replicate video to publish environment and check, if still not appearing then clear cache and try.

Yes, the change will not reflect in live copies. you need to manually move live copies. if the count of the live copies pages is less then you can very well use Move option. if the count of pages in thousands then it is better to write custom rollout configuration. the custom rollout action should i...

if you are working in a lower environment then you can use CRXDE to change page names, or you can use Move option which is in Touch UI to rename a page, but it depends on your requirements. you can use "page name after move" field to rename the page name

There is a good article in HelpX on restructuring check itAdobe Experience Manager Help | Common Repository Restructuring in AEM 6.4

too many records of this list to configure in the future means records in the tab or too many tabs ?

In project B, you need to change the configuration in the filter.xml file.ui.apps\src\main\content\META-INF\vault\filter.xmlOpen the filter.xml file and look for  <filter root="/apps/system/install"/> if you see that in project B then this is overriding Project A folder

I am using AEM 6.3 SP2 and I don't see any issues, what is the version you are using ?

Increasing sling.max.calls is not a problem, but you need to think about page performance if you author more than a certain number of items let us assume 1000 items in the multifield then it will directly impact on the page performance, sometimes it may take minutes  (20 to 30mins)  I feel it is not...

I always prefer KISS policy instead of making things complex, I do not like overwriting nameHint param for a simple requirement if you find any solution on nameHitn param, request you please share with us. fine-tuned way means in terms of what  ? are you expecting on performance ?  or maintenance? o...