I have read several posts on this subject but none very recent.  It seems I must be missing something very basic.  However I can not enter a value such as 2-1/2 in the command line while drafting and get a meaningful result.  The action which follows does not correspond in any way to the imperial value entered.  I saw this may be a know bug, though other users claim they do not have the problem.  Is there any update on this subject?  For those of us that work with both metric and imperial figures it is sort of a deal breaker that we can not write in feet/inches/fractions while working.