Suggestion
National team baseball and championships (world, continental) for that teams
Reason
The coming up of this year World Baseball Classic makes necessary a separate level for the creation of national teams for every nation with "baseball level" from "poor" to "excellent", creating, if necessary, players for national team effects, for being scouted and/or signed by ballclubs ("organizations" according to OOTP jargon) or, at least, put in the free agent pool after his/her participation, suiting continental and world championships and (if wished) qualifiers for that competitions for every national team. For the case of continental tournaments (North American, South American, Asian, European, African and Oceanic) it's simple to put the correct countries, due to the continental affair in the game.
It's neccessary rules for national team eligibility for every NT, as minimum year of service in different NTs, and the another nationalities (apart of the main that) for every ballplayer colud be measured according to the foreign leagues/ballclubs played for that players. For example: a Japanese could be eligible for play for Japan, and also for the USA if he played previously in the major leagues, or for Mexico,
PR, DR or Venezuela if played in any Winter League(s).
Priority
High for the OOTP gamers (like me) that have wished to simulate national team baseball, medium to low for every another case.