Oh finally a lower multiplier, useful for items like amplifiers (think uCurrent). I still wish it would be arbitrary for odd divisions.
I think the range still needs to be larger in both directions. 0.001 seems arbitrary since all the scope is doing is helping with the math. A Tek AM502 amplifier, for example, ranges up to x100k and would need 0.00001.
If it helps, non-decade values can be entered by switching the Probe Ratio units to Decibels and adjusting the dB. You can probably get close to the ratio you want, and it nicely displays the ratio as you change the dB.
You can also enter an exact number via the SCPI command:
CHANnel<n>:PROBe <ratio>
but the ratio is still limited to 0.001 - 10000.
In the same vein as an arbitrary ratio from the front panel, I've been asking for an error offset adjustment. An error offset would be almost the same as the regular offset but it would not be included in the display offset, measurements, or math calculations. It's primary use would be to zero out small offset errors at the input, such as from external active probes.
The uCurrent is a good example of where this would be used. You could zero out any drift or offset right before you take a measurement. Another use of this is to zero out short-term front end errors before making a particularly sensitive measurement, without having to sit through a full self-cal.
In general, a way to adjust the slope and intercept of inputs before any processing has been on my request list for a long time. It's not rocket science for any DSO/MSO manufacturer. I don't know why it's not standard.
EDIT: That last statement was a little ambiguous. What I'm saying is that I think there needs to be a way to define: 1) an arbitrary input multiplication factor and, 2) what input voltage level that scope should use as zero.