simultaneous disabling / enabling of all LTM objects

Sounds like a job for...... dah dah dah dah!!! Automation Man :)

So it depends on your exact requirement, knowledge, available tools and how much you time you can commit.

With a bit of effort you could knock up a Python or Ansible script that queries for a list virtual servers / nodes / pool members stores it to a list and then sends a request to disable them all. You can even build in a step to verify that you want to stop everything or just select the nodes you want to stop

if you have a more static environment then you can forgo the query part, but if you're looking to kill everything querying what's actually configured is a better option from a security point of view.

There is a wealth of intro videos on Youtube