Hi there. This discussion would probably be a bit better if it were taking place at NRaas. We still support the mods and development on them has never stopped. We are always happy to entertain new ideas for the mods and fix things that are or become broken, but this is really more an issue of fine-tuning the mod to get it to manage things in line with what the player wants. Or, to put it bluntly, we probably aren't going to change the default settings for SP right away because some players whose sims are trying to find mates would prefer it. But we do actually have a new version of SP in beta testing right now. ;)
http://nraas.wikispaces.com/StoryProgression%20Testing
We think that Twallan (our founder, now retired) just hated the idea of inactive sims around town remaining single for long and yes, on default settings this rampant partnering up will tend to happen too quickly for many players' tastes. It's all adjustable though, and we can help you with the settings you might prefer a bit better over there.
Whether we want to talk about slowing down the Romance Manager -- by the way, that setting is for sim minutes in between cycles of the Manager, not how long it takes the mod to partner up the next sim exactly -- or how to reserve a class of soon to become of age sims so that a pool for dating remains available, it's all doable. Many players over there will have different ideas and ways in which they have arranged these things in various worlds.
The whole point of much of the NRaas suite of mods, but especially StoryProgression, is that so much customization is available. This isn't a real "issue" that by itself should be preventing players from enjoying the mods, it's an example of the default settings perhaps not exactly fitting in with everyone's style of play.
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(Yes, we know that Wikispaces is shutting down, but you can ignore those warnings over there as we will have moved to our new site before that happens in Sept)