Hi,
the short answer is "No". The long answer is that since SE is a mechanical
design system, civil and architectural scales were not put into SE so you
are stuck with the ratio system.
.... but internally they are known
Help --> Programming ..
PaperToModelScaleConstants Constant Set
igArch_1_4thInTo1Ft
igArch_1_64thInTo1Ft
igArch_1_8thInTo1Ft
[...]
maybe the only use is for translating to/from ACAD which is able to show
but SE will convert them to a decimal ratio.
dy