IMHO you want the safety of being able to shut off all of your 12V if you need too. This is easiest if you wire everything through the battery switch. There is a reason it is called an "Isolation Switch"
The limitations to the number of ring connectors is based on the size of the post. You risk overloading the post on the switch by adding more and more components. You can install a PowerPost, which acts like a 'remote (Pos.) battery post. They also make Positive Bus Bars for the same purpose. I prefer to have batteries connected to switches and devices connected to a power post or bus bar. Much neater and easier to manage.