The 5ft measuring ruler is super useful for RPGs like D&D but there are many other systems that use different measurements. Miles for overland movement, Meters for modern games, inches for tabletop games or just a plain square count for most boardgames.
If you could set the base count as a number (eg. 1, 5, 24) and the unit as a text string (eg. square[sq] inch['], feet[ft], miles etc..) that would be awesome!