Seeking method to change what is displayed in Filter-->Focal length

When in Bridge under the Filter tab-->Focal length what I have listed is 5mm, 5.8mm, 6mm, 6.2mm, 6.3mm, 6.5mm etc. etc. and the list goes on and on. The conclusion being that this list is way too lo0ng to serve as a good filter to me.

I sold all of my lenses 2 years ago and replaced them with one zoom lens (and at times a pocket camera also with a zoom). I couldn't care less if the photo was taken at 6mm or 6.2mm. To me they are just about the same thing. However, I would like it if it actually game me a range say 5mm-10mm; 10.1 mm-15mm etc. Now the filter makes sense to me being more manageable. Is there any way of making it so?

In other words I no longer want to see:

5.8mm,

6mm,

6.2mm,

6.3mm,

6.5mm

But would like instead to see:

5mm--10mm

10.1mm--15mm

15.1mm--20mm

Which are in increments of 5, BUT, increments of 10 would be fine as well or even better.

Thank you