That's a good deal.

Meanwile I found also my way.

In most cases I mark in GSAK caches which are important for me or have more favorite points than the threshold I set.

After that I transfer the DB to my smartphone, the device of my wife and the tablet which is mounted on my dashboard in the car.

Now I will do this in GCDROID directly and afterwards I share the DB to the other two device.

I have installed V2.31 and I'm pleased about the color tags.

So I am importing GSAK DBs with GSAK User-Flag marked Caches into GCDROID. Now the question is, how do I adjust the Userflags with the GCDROID tags?

"draw a colored circle around it"

That sounds good. 

Something like this example

Comming from GSAK and GDAK I had used there a user flag for marking very interesting geocaches in the database.
This way it's easy to change my route dynamically if a colored Cache appears on the map. I would appreciate it if GCDroid would support this feature as well.