Well, yes: add them. It would really be important to know where you are actually trying to do this and get an example.
However it might be In general roads in OSM have more helpful if you could explain why you want to add more points (increase accuracy or other reasons) and give us an example where you would like to do so (link from than enough points. Are we on the main map page). And likely it would be good to know which editor same page here given that you are using.referring to boundaries, we may have some confusion in the OSM usage of "way"?