Do you have an automation strategy in mind for the long term? I agree with that a python (or similar) script makes sense if all you're going to do is make adding/removing app servers a little easier. But even that might benefit from a thoughtful analysis of what you can start today versus what you would like to achieve tomorrow. For example, if you have a lot of app servers you will be adding/removing, you could build an app template that will take in the *expected* app servers, whatever that state is, and then send the declaration to AS3 to update current state on the BIG-IP. You have a lot of options, but I'd encourage you to think through where you are today, where you'd like to go, and then post back with a strategy. There are a lot of people here who can help you work through the details.