When printing layers smaller than 0.15 I am having issues with bed adhesion and difficult first layers. I have successfully used a 0.2 mm first layer and then built for instance 0.1 mm layers on top of that.
...but the setup is tedious. For instance having to define support for several print processes and sometimes the setup is buggy (resetting itself).
How about having a "first layer thickness" setting? It would work great for these tasks.