These recent German and French tournaments made me realize that national team players should have just as strong connections as players on club teams have (a green connection worth 2 links).
Those guys from Germany have such good chemistry in real life such as Kroos, Schweinsteiger, and Ozil, and the links between them should be strong to reflect that regardless of what country they play their club football in. The same can be said for Spain (Fabregas, Iniesta, Torres), Netherlands (Robben, Sneijder, Van Persie), and plenty of other nations.
If FIFA chemistry is supposed to mirror the relationships between individual players accurately, I think this would be a welcomed addition (and also allow for more flexibility and creativity for hybrids).
*Also, Messi really shouldn't have the same chemistry link with Aguero (Messi is godfather to Aguero's son) as he does with Pepe, right?