I can agree with merging Lithuania with the rest of Baltic culture <OR giving Lithuania baltic state culture> for the following reasons:
A> Lithuanian culture/language is considered by anthropologists to be a part of the "Baltic" group, including the Latvians, Old Prussians <now extinct> and other small ethnic groups like the Yatwingians and Semogitians that have now been assimilated into Lithuanian or German society. Realistically, Lithuanians were very close culturally to the peoples that occupy the baltic culture provinces in EUII, and have substantially similar historical backgrounds. While there IS a difference between the Latvian and Prussian cultures and the Lithuanian culture, there is logic behind integrating all of them into the Baltic group.
B> Lithuania did have substantial claims to Memel and Courland on a cultural and political level <in fact, a sliver of Courland and the entire Memel province belong to modern day Lithuania>, and integrating Lithuanian and Baltic cultures would allow this on a gameplay level. Lithuania doesn't have to, and probably shouldn't recieve CBs on the other Baltic provinces, but this is a good way of simulating this claim.
C> Many of the Balts <in this context, the Latvian and Prussian provinces, but anthropologically "Balts" refers to the "Baltic group" mentioned in A> were still pagan and still practice their ancient customs under German rule. A significant cultural rift had not yet grown between the Lithuanians, Prussians and Latvians <in modern times, Latvian and Lithuanian languages are still more similar to each other than any other language>.
Also. To clear something up. "White Russians" refers to the Belorussians, most of whom consider themselves a distinct cultural group from both Lithuanians and Russians. The people and territory now known as Belarus was part of the Grand Duchy of Lithuania since the 13th century, and some of modern Belarus was the territory of various Lithuanian pagan tribes before that. Also, modern Belarus' national symbol is a stylized version of the Vytis <The white knight rampant on a red field, also national symbol of Lithuania>. I'd say Belarus province in EUII is staunchly Lithuanian/Baltic culture in 1419 though. Belorussian nationalism is a rather recent phenomenon.
And I don't know what the hell Pithorr is smoking. Honestly. That's one of the most "interesting" <my mod-conscious adjective> statements I've ever heard.
Lithuanian culture was (and is) reality. It's quite different from Latvian (closer to Prussian - means inhabitants of Prussia BEFORE Teutonic Order). 
