Sorry to be late to answer you, didn't have seen this topic before...

About IP, when i developped this plugin, i didn't include IP because of the terms of use of Google Analytics (which, because of protection of personnal information, were not very clear if we can or not, when using Google API)
But today, terms are clearer.

What could be better, is to add a function to detect if a user is connected in admin and test his IP in direct (not in a variable), and, using sessions table from Joomla, check it in front-end.

For example, to integrate this with the group level checking (first IP test, and secundly, group test option) :
If ((visitor frontend - IP == Admin User logged in - IP) AND (User logged in - session client ID == 1)) {
Not Track
} else {
Do tracking
}

As i'm mainly working on iCagenda v3 developpement, i won't be able to test this idea currently, but as soon as i've made a test, i will keep you informed !