Add an "always last" option to taskbar items (index would be even better!)

There should be an option where you can set some application (A) to be "always last".

So when a new application/window (B) opens in the taskbar it will still be before A.

But a bool (ye no) is not enough actually because I have 3 applications I want this for, so an index would be better.

Lets say all applications have index 0 by default.

And then the user can give positive or negative numbers to specific entries in the taskbar-inspector.

Anything that has a negative value goes first (more negative = sorted even further left/first)

and everything that has a number greater than 0 will always be sorted after the default stuff.

Also, thanks for your great work man!

edit: I found this: 

https://tweaker.userecho.com/communities/1/topics/719-user-defined-order-of-placement-on-taskbar

which seems to be more or less the same, but the request is really old :(