Just spitballing here, but wouldn't a good mod be one that lengthened the campaign from a mere 200 (or so) turns to something more epic and in line with the other games in the series? Going from 1630 to 1830 would be (imo) a more appropriate time frame. Having your tech go from pike and matchlock up to the cusp of percussion cap rifle toting armies would be more faithful to the past games in which you continually improved the fighting abilities of your armies. Sorry if this is a double or triple post, but I couldn't seem to find anything overtly similar with the search function.