Hey!
I use rekordbox from the start, usually just with my laptop linked to two pioneer nexus players. Of course I can browse music and lists on the players, but I prefer to do it on the laptop as it provides a bigger screen and easier searching/sorting options. I recently bought a new laptop (Acer Spin) with a touchscreen and I think as more and more people are using touch screens it would really be very nice to perfect how rekordbox behaves with a touch screen.
I don't think much work is needed TBH, rekordbox already provides excellent options to change the GUI size and behavior, but a few scrolling and keyboard input fixes and I think many many DJ's would be very happy, not having to use their keyboard/touchpad anymore.
Would be greatly appreciated!