Well, we came across the idea of awarding one SPP per game a player was availiable. That means on the field or in the reserves box, not "Missing Next Game" or missing becausedue of a Niggling Injury.
The reason is, my league dislikes ageing. I agree with other coaches that while its a good thing to have more players retired and players that are "no longer perfect" we feel its to hard to level up a specific player especially linemen. This is also affected by the no SPPs for a foul rule.
The 1 SPP per game rule would mean all of your rookies get their 1st skill after 6 games, unless they are killed or find a better team

I would be thankfull for feedback, weather to introduce this feature to the league or not .