I agree but at the same time I don't think Black Foreigners have a right to tell native Africans what and how to run their system and way of life.
Right, and no one is advocating that. It's still their land and country.
@Angelic Servers is right though, unless you have family or other close ties in a particular country, one has to be strategic for such a move. Why not help fill-in a gap a country has in a particular field in order to improve it.
Concerning leverage, I'd say it'll depend on what the country needs. For example, many of these countries are trying to improve their healthcare infrastructure, especially with diseases like ebola being out there like that. If you are a medical practitioner or administrator with experience in such a thing, that's something to look into.
Point being, its not about dictating how the countries should act, ultimately, they (the governments and / or consumers) will accept your help / services or not. But the nations need investments and /or talented individuals to further develop their nations. Blacks in the diaspora have that. Gotta find out which country or countries can be a fit for you.