Yes, the step size can be changed (it defaults to 1.25m). Setting it to half the default will hit most of the "standard" sizes (except 0.9375 but you can also set the small step to 1/8th of standard and get that with two clicks from either 1.25 or 0.625) @PART[procedural*]:AFTER[ProceduralParts] { @MODULE[ProceduralPart] { %diameterLargeStep = 0.625 %diameterSmallStep = 0.15625 } } And as @Stonesmile said while I was testing this. You can directly type in any value using the KSPComm
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