Not to sure if this helps but if you go to 'Edit>Current drawing preferences' under the 'Units' tab you can select both the 'Format' (Architectural from the drop down list) then 'Precision' Under that you can opt for a variety of precisions, ending up with 0'-0 1/128”. I don't expect that your back yard will need anything more accurate than that. That is assuming that the selected 'Main drawing Unit' is set at Inch. If you use any other 'Main drawing unit' the precision can be set accordingly. If 'decimal' is your preference the precision will run to 4 decimal places.
I cannot see any way of adjusting the 'rounding though.