In my effort to deeply understand the vast capabilities of Lemur, here are my questions:

In the example situation above I understand that:
The disabled "x" means that no message is sent to the OSC and Midi targets. The disabled "out" is a user defined variable so I figure, this also disables the OSC and Midi targets for this. As I understand, disabling "out" doesnt disable the "selecttab" action I have specified in the user defined variable "out".
Question 1: Does that mean that Lemur also doesnt "monitor" the incoming messages for said parameters? In other words, is it a good practise to disable anything in my project which serves as a control of other elements inside the project in order to have low usage of RAM;
Question 2: Since I wont be using any Midi/OSC targets to select the tab, would it be best if I had created a multiline script and not an "expression" for selecting the tab via the value "x" of the button?
Question 3: What exactly the checkmark on the name of the button "Custombutton8" disables? At first I thought it would disable all the elements down the hierarchy but thats not the case - as I tested if the script "action()" works with "CustomButton8" disabled and it works. So what does it really do?
Thanks in advance!