If it is not used then you should remove it from ADOM.CFG.
For just one quick example of long text that should be skipped by hitting enter, try generating a new character (a race & class combination that has a large starting inventory, such as a wizard) and dropping all your stuff in one go ("d" then "1", compare ":d" then "+" in 1.1.1). Enter does NOTHING. Only spacebar advances text. I haven't found any text that could be advanced by pressing enter.