Dealing with Navigation Manager

[RisingGlow]

I recently decided it was time to upgrade vBulletin to the latest v4.
The biggest issue here is the navbar and it's tabs.

What I used to have it as before was the forum home page would show the tabs Forum, Blogs, and other plugins' tab like vBshop. However, I had a custom page where if you were on it, it wouldn't show Blogs or vBshop tabs. It would show other tabs that I assigned it to show ONLY on that specific page via THIS_SCRIPT. This is still possible for me because I'm adding tabs, not removing. It was easy for me to do just by editing the navtab template or sometimes creating a small plugin. Now after 4.2, I can't do that anymore.

I am wondering if there is an easy way hide a tab by the script it's running or somehow create something like this.