This is a branch of sby's moreCumSpurts mod. It uses a different coding approach behind-the-scenes, but the main difference is that it's intended to be easier to customize. It also works within the original SDT code, so there's no sharp distinction between "normal spurts" and "extra spurts."
If you take a look at the Settings file, you'll see that it explains how to achieve special results (such as a scattering of rapid-fire spurts, or a single sustained "firehose" spurt). It's expected that users won't actually use these extreme settings in-game (because they're goofy), but they help to illustrate the flexibility of the mod. You might try out the "firehose" mode, and then choose settings which are much closer to the default (but still delivering a few extra-long spurts during each orgasm).
The source code is included in the 7z archive.