Not sure about other players, but I would like the have the option of selecting dynamic display to show how many weapon marks are left until the advancement to the next proficiency level for the currently wielded weapon (or shield, missile weapon, thrown weapon...).
Perhaps use adom.cfg for extra variables to further allow customization.

This would:
a) save me the time and effort necessary to consult the ctrl+w menu to check how much each hit on a given monster gives
b) know immediately that I might be close to the next level, which will prompt me to kill those ~3 more monsters for the advancement
c) enhance the nice feature that is dynamic display, with a potential for further enhancements in the future