Setting up Football Manager for more international / realistic regens

So I've been wondering about different ways of setting up the database and leagues for a nice balance between realism and gameplay. Add too many leagues or players and the game becomes too slow. Add too few and no clubs outside of your own leagues get regens which severely hurts the realism from a world cup perspective.

I couldn't really find an answer or guide to this question and thus decided to throw my own tests on the interwebs.

TLDR:

• View league gives no regens.
• Small vs large database matters a tiny bit and is not worth it.
• Adding all current internationals creates a healthier global...