As I said, any further development (if a workaround for the buggy/unsupported country = TAB command could be found), would require massive help.
The overhaul would have included a complete remake of the map (now that an editor is in the works, if all breaks I'd have written one now that someone who understands the source files for the map can be found), a complete remake of all historical events, a complete overhaul of the economical and trade system (too many small and minor countries ended up with no ressources and too many majors ended up with huge stockpiles), a complete overhaul of all ministers and elections in democracies, an at least minor overhaul of the tech trees (complete overhaul of the doctrine trees).
Creation of scenarios for the years 1936, 1939, 1942, 1945, 1948, 1951, 1954, 1957, 1960 (usually 1st January, possibly other date)
The overhaul would start with map and economy and other global time independent changes.
Then the rest, ministers, events, techs, would be done on a year by year basis. which means, every year is made complete before a new one is started.
1936 would be playable 100% full features minus final beta testing before anything in 1937 is touched. This would include countries, AI and everything else. This would possibly have caused an episodic release for each scenario with the end date set to the next unfinished date. So the first released scenario would only be 1936 and run until 1939 (boring maybe but from then on it'd get better.
This way things would be focused and it would be easier to balance things and keep an overview for each year which previous events/happenings would have to be checked to make new ones based on them. The event tree would grow in width every year and no decision made by the player would lead to a dead end without events.
It would also be a must to have at least 1 event per month for every single country, even if not very game changing. There is never a month in a country's history in which nothing woth mentioning happens.
For each year that starts a new scenario (mentioned above) there would have to be OOB of course.
As you can see, this would require a huge load of research and implementation work.
This cannot be done by 1 or 2 people, neither can it be done by 5.
For the research alone we'd need 1 person for each major at least, one person per continent for the minors at least and at least 5 more people for additional research and 5 people for scripting and 2-5 people for graphical and other minor stuff.
So if you can round up a reliable 20-30 people team, call me and we can talk about it...
development would realistically take about 3 years then.