A few years ago I first learned of the -r flag by using the old jzintv GUI
Within the GUI, the "rate control" slider goes from 100% (normal setting and no -r# flag is applied) up to 500% (meaning -r5 flag is applied) and the sliding rate control setting goes in 25% increments
So a -r1.25 means 125% or a 25% increase in speed, and a -r2 means 200% of normal speed.
Within the GUI, after you slide past 500% there is a MAX for the rate control, and it will apply a -r0 flag. It sounds odd to have a -r0 flag, so I've not tried this setting. Should the Max setting on the rate control slide be -r0 or -r10?
If the --macho=5 flag equates to -r5 flag and the --macho=10 flag equates to the -r0 flag, does that mean we can set any macho value from 1 up to 10? And can we set decimal increments, like --macho=1.53 or --macho=7.65?