This is something that maybe has already been brought to your attention (H.G Muller) but I do not recall reading anything on it.
Alessandro Scotti didn't get around to making the suppress PGN comment and tags menu selection items. Something maybe you could possibly add to your "to do" list, if it is possible to add the items?
As it is now, to suppress the PGN tags and comments these entries need to to be manually changed to false in the winboard.ini file.
/autoDisplayComment=true
/autoDisplayTags=true
The graphic below shows what I mean. The graphic is representative only as maybe this isn't the best place to put the suppress options. I was thinking maybe check marks for when either one of the selections is enabled.
Though I was able to figure out how to add the items to the menu, the menu items do not actually do anything. That knowledge I don't have.