I agree with the numeric values. That's another thing I like about Moon+ Reader Pro on Android: it is similarly customisable to Marvin (in some respects, even more customisable -- in others, less), but what Moon+ does is that it always pops up a numeric value whenever you customize anything there. Are you reducing page margins? Moon+ pops up some numbers there. Are you enlarging/shrinking font sizes? Moon+ pops up a number for you.
I would appreciate such clarity in Marvin, too. Because although customisation in Marvin works without a hitch, it's a "blind" or "vague" experience: you do get the result you want to see, but you don't know how you get there; you simply need to keep pressing buttons on a trial-and-error basis, until you see the exact formatting you prefer. There's no easy way to remember, or replicate in another book (or on another device running Marvin!), just what it is that you've managed to set up.
It's not like Marvin isn't similarly clear in other respects: one of the great features in Marvin is that when you reduce/increase brightness by sliding your finger up or down, you get to see the exact numeric percentage of the current screen brightness. I find that extremely useful in Marvin. (I have seen many other e-readers that allow you to control screen brightness in this way, without popping up the numerically exact percentage indicator.)
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