you should be able, to navigate to the correct folder before uploading files via finder. Than they should be in the correct place.
In most cases, this shouldn’t be a problem. If you used the wysiwyg field with images/assets, there might be wrong path names, that have to be replaced after renaming the folder.
This is not necessary.
That’s a general problem. I think, the finder is too powerful for most use cases (It’s possible to create or change php files…). I like to use multiple user groups. The manager group can do everything, except changing the config file and using the finder.
If you use a different user than the admin, you can define finder.path to /storage/uploads or leave that one empty, because the uploads folder is the default for non-admins with finder access.