Menion, congrats to this great step and your efforts to rework the vector-engine for improved dpi-awareness and adaption to newer mapsforge, happy to see this.
I am also using some raster-maps with limited zoom-levels, Z13 and Z16,to keep the map-size low and as Z14+Z15 doesn't brought a real gain in informations. But this only works if the zoom-transition between Z13 and Z16 is fine tunable, may depend on screen-dpi and personal taste. Sometimes I would prefer Z16 with value lower 50% instead of Z13 at 200%.
i guess currently I'm not able to finetune this or? Maybe in the future, not high prio, just realized this while using the new beta.