In MAS, i have the following tool:
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Open the Content List, apply some filters (by site, by category, by date; change the sort order) if needed, and change the active page, so that the desired series of links, you want to apply schedule at, is shown on one screen. Check the boxes below the links' ID numbers, or click the Select all button at the bottom of the page, then select Manage time schedule and click Go.
From the new page that will appear, you have another 2 choices to set the schedule:
* Distribute selected links in period - here you set the starting date and the finish date, and MAS will give the selected links dates, distributed at equal intervals between these 2 dates, inclusive.
This option is useful if you don't care at what exact intervals will the updates be, but you want to ensure uniform updating through a desired period, up to the finish date.
* Distribute selected links at intervals - here you set only the starting date - it will be applied to the first link, then the rest of the links will be set with dates increasing with the given interval.
Use this option, if you want to ensure that your sites are being updated regularly, at a firmly set interval (daily, weekly, etc.) MAS will do the necessary calculations shwowing you which date will be assigned to the last content link.
* The additional checkbox Shuffle Links provides a way to randomize the activation dates. If it is unchecked, dates will be distributed equally amongst the selected content sets in the way they were displayed at the Content List when choosing the batch operation. If it is checked, the content sets will be shuffled first, and then assigned the new dates. This is particularly usefull when you have bulk-loaded series of content and it has appeared for example in alphabetical order by model, but you want to make it appear on the members area at a random order.
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And they did something in the configuration files to make that rotate in autopilot.
In Adultwebware CMS i have this:

And it explains the stack rotation this way:
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The real stack rotation is the most effective one for big paysites which have at least 300-400 galleries (7-9 thousands of content items) and more. This way you can set the starting amount of content which is always visible to users, say 300 galleries of 400 (75%). Then each, say, 2 days 2 galleries will go "up" and 2 "old" galleries go "down" at the same time. In this example it`ll take 100 days (3+ months and one week) while rotation will go its full circle. The content which is always visible was named "stack" for better idea of how it works. The unavailable content which is out of "stack" is always being mixed to make almost unlimited combinations.
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