@McTosh - I don't know if I will be able to accurately explain this. But, what you describe as happening with the relativity mod is exactly what my Sims do in their normal life.
Using dinnertime as an example, it's like watching two different systems in play. The first one is the games measurement of things, such as the hunger bar filling up when eating a meal signifying satisfaction. While the second is what the Sims choose to do until they are actually satisfied or content. On occasion, my Sims help themselves to seconds if they are still hungry regardless of what their hunger meter says and they do not get the 'stuffed moodlet' either.
Mealtime is a social event for my families, it is a time to catch up or just talk about what is on their minds. All my families take their meals together (unless someone is at work or otherwise detained). Even when one (or more) finishes eating before the other(s), they continue to sit at the table and chat, they don't get up right away and move on to another task until they are ready to end the conversation. On occasion, one will get up clear their place and return to the table for conversation (sometimes they sit back down and other times they stand). Here's an example:
Family Gathering
Peter (white hair), Barbara (red bob), Jamie (blonde hair) and Thornton (in suit) are in town for Gwen's and Ricky's wedding (head & foot of the table). I had them group up for a full day of activities and disbanded them after they sat down to dinner. There was plenty of conversation during dinner among all.
https://www.mediafire.com/convkey/6a51/4jvazspvi0zim9a6g.jpg
After dinner Jamie & Thornton went to bed (they were tired), a while later Ricky went to use the bathroom (and then went to bed). Barbara finished her food but continued the conversation using 'idle chat' while standing by her seat. Once Barbara was tired of conversing, she left. Peter and Gwen stayed continuing on with their conversation. The wall they face is blank (some of it is visible in shot 1), there is nothing on that wall which would hold Barbara's or Peter's attention; they were all talking.
https://www.mediafire.com/convkey/047a/q2srn0fwyexu0736g.jpg
This happens all across the board no matter what they are doing, they fully and thoroughly enjoy themselves to a level which is sufficient for them with no real respect for the predetermined game levels.
