Sorry, yeah, train actually sent me the spreadsheet after already shuffling my deck. I usually add the random function to a separate empty column, copy & paste it to the rest of the corresponding columns for the decklist, and then sort the decklist column and random column in whatever the default is for sorting (I think ascending, but it doesn't matter). Don't worry if, after you sort, the random numbers aren't sorted because every time you "do something" on the spreadsheet, the random number is re-calculated. But it did sort correctly according to the previous random numbers (just look for the high or low number and see if it got to the bottom or top).
hrothmar: We've been doing the mana base as non-Highlander with respect to basic, duals (regular and Ravnica), pain, and fetchlands (I'm not sure if that comprises a "category" so I just listed them).