There are a few other ideas posted that relate to visual clue icons and hover text for specific domino Designer features, but why limit to just those features/contexts. Most users have come to expect hover text for just about any icon-thingy that they encounter. Designer provides hover text for the column icons in the design list views (e.g. No Refresh, Inherits Design, etc.), the tabs in the design properties dialog boxes, the open window tabs, etc.

Hover text should also be extended to the visual clue icons in other contexts of Domino Designer. For example, a field shows a visual clue for the data type, and in some cases the field style (Notes or Native OS). How about displaying hover text for these icons that show if the field is editable, computed, allows multiple values, etc. And, if we get a visual clue for denoting that a hide when formula exists (as suggested in another idea that someone posted), show the actual hide when formula in the hover text.