Self-contained managers should work with a small fix for “Fly To” node to smartly lookup the right manager for a pawn instead of blindly using the first one (that’s how it works now). I’ll look into this in a week or two, should be an easy fix that will deliver great value. For people who’re using direct API calls instead of the “Fly To” node you can just tell the API which manager to use yourself.
Again, each manager is self-contained; a pawn in one navigation zone can only pathfind within that zone. Inter-zone/Inter-Manager navigation could be a nice strategy to support large maps so I might investigate that mid-term. The Octree voxel approach suggested by others is probably a better long-term investment but it has “Giant time-sink, Developer beware!” written all over it 
so I’ll instead try to support multiple zones for now.
Thanks a lot for checking out my game! I hope to make it an all-encompassing Nature Sim and as long as I can sustain development I’ll keep inching slowly towards that goal.
Steam Greenlight was supposed to happen last month but releasing this plugin took so much more energy than I expected that I couldn’t work on the game for almost a month at that time.
Vivaldi’s music fuels both development and the promos! There is little doubt in my mind that some 300 years ago the inspiration for his Four Seasons Music draws from the same fountain that I’m tapping into today. Now whether my game ends up at least a wee bit as good as Vivaldi’s compositions, only time will tell 