Installation went just fine (enabled extra-devel, selected Rubybox 0.4.5 that installed Dosbox 0.73-5 as dependency), apps work with 2 small problems:
1) to make onscreen keyboard work I had to press home key, launch terminal and type something with it, then I went back to the active dosbox session and it was possible to use it
2) HW buttons work included D-pad, but if the screen turns itself off while dosbox is running they get deactivated and you need a couple of taps on the touchscreen before they get back in action

I'll try later to wipe any possible old configuration that survived the uninstall process and start with a fresh install of new games to check if these problems are still present.