Exactly what it says on the tin. I'm not sure how I can elaborate.

Implemented in V15.4.0.

This is planned. However, it's a little harder to do than one would first think. Expect it somewhere in the next few releases, but not in the next one.

By dummy items, I'm presuming you mean pistons, gaskets and the such?
If not, I don't understand

This is planned. However, it's a little harder to do than one would first think. Expect it somewhere in the next few releases, but not in the next one.

You asked me to put in a ticket...