In solidworks can you use .5 increment scale on drawing?

Hi,

For good drafting practice can you use .5 increment scale on drawing?  For instance, my drawing view looks good in 1:1.5.  (1:1 too large and 1:2 too small)

Also after define your scale how can you add it to the drop down list for future use?  Thank you

SolidworksDrawings And Detailing