I guess it won't be possible to share database data of Ohanah events, please create a ticket in our Support Center and attach this component, we will take a look but can 't promise a success. sh404 may have problems because it ...

... addons instead of parked domain, each site are completely separate sites - the main feature I would like is to connect them with jomsocial. That won't work because MightySites can share only database data, but addon domain will use own folders. So i.e. avatar uploaded in site A won't be available ...

by having each domain as a parked domain - won't that negatively impact seo for each country domain ?

is addon not better from an seo perspective ?

can multisites not work with addon domains

Yes, you will be able to share database contents.
But note that domains won't have same files, so i.e. image from site A won't be loaded in site B, you will need to manually copy article image for all sites.

If you install the same extension on site B...won't it install over the existing one for site A? Meaning it will replace the files.. so you need to make sure you install exact same version on each site right?

... so updating updating main site will affect all clients sites. Basically this can be not main site but kind of "root" special site (you won't even need to register a special domain for it, just use root.mainsite.com subdomain name).

Yes, single Joomla installation is better for you, in this case all files including images will be also shared, so you won't have problems with avatars. Note that MightySites shares database data only, not images. Using different installation will create additional problems, eg. user ...

FB Connect works, but if you configure single login in MightySites from site A to site B,C and user logs via Facebook in site A - it won't be auto-logged in sites b and C. He will be only logged in site A as usual.

Sorry, we won't develop such integration.

... bridge software to regain those features. My initial question is: When will the converter from Kunena to phpbb3 be available for Joomla 2.5? I won't change to any software that causes us to lose our current forum, so this is crucial.