Feature requests should be specific, realistic, and actionable.
Make sure you say what benefit the feature would have.
Using this guide here: How to change desktop layout in cinnamon It is possible to group windows on the panel just like it is in the new panel layout of Linux Mint 19.1 Cinnamon.
What I am missing is that active windows or better said opened programmes are highlighted, if you put more programmes into the taskbar.
See this screenshot:
Would it be possible to implement this? @oberon?