No offence taken

This is what forums are for; discussion. I definitely agree that the keyboard controls and groups are indeed extremely handy. I use them myself all the time. Especially the left arrow key that brings you to the parent object is very useful in many cases.
However, I feel that as ZGameEditor gets more and more powerful, and its ability to create bigger and more complicated games gets better, bigger projects will require such a filter feature. So maybe it's not something that is essential in the next few releases but I do think that in the future, it will come in handy.
For example, if there are two objects that you need to work with for a while, then maybe in the filter menu you can type something like Object1 && Object 2, and the tree view will only show you those two objects, for convenience.
Please feel free to tell me if there are other things you see deficient with this idea. Criticism is a good thing in general
Thanks,
Yılmaz