Change the dock icon (color & label?) to the currently selected compression method

Hi,

I read that a relatively big GUI update is in the making, and the best you could do to really improve things would be the following idea:
Make the dock icon change color (looks, like in terms of a label) to the currently selected compression method.
1. That would be a unique feature, something unheard of in the compression utility world of macOS.
2. It would help to know what Keka will do on drag'n'drop whilst it is hidden/buried in the background.
3. It could also indicate progression whilst in the background.

Do you know [Adium](https://adium.im/)? In Adium you can change the color of the duck in the preferences and when a message arrives, the duck even moves! In the case of Keka, a movement (e.g. the Keka bug spinning ;) Maybe a bit overkill, I know, but the ideas flow right now) could indicate work in progress (for instance compression in progress or decompression in progress).

In my opinion, that would really help this app make a huge leap forward when it comes to usability. Now, I always double check if I _really_ selected the correct compression method. That step could be cut out by a glance at the dock icon if it would indicate what Keka will do by color or a meaningful label.

If you wish, I could make a quick mockup at the weekend showcasing how I imagine it, if that is needed.

Greetz