Per world events much? Untested, but might work perfectly fine.

CustomSimplePluginManager.java

package net.darkseraphim.worldlyplugins;

import lombok.Delegate;
import lombok.RequiredArgsConstructor;
import org.bukkit.Bukkit;
import org.bukkit.event.Event;
import org.bukkit.event.HandlerList;
import org.bukkit.plugin.*;

import java.util.logging.Level;

/**
 * @author DarkSeraphim
 */
@RequiredArgsConstructor
public class CustomSimplePluginManager implements PluginManager
{

    @Delegate(types = PluginManager.class)
    private final SimplePluginManager delegate;

    protected void fireEvent(Event event)
    {
        HandlerList handlers = event.getHandlers();
        RegisteredListener[] listeners = handlers.getRegisteredListeners();

        for (RegisteredListener registration : listeners) {
            if (!registration.getPlugin().isEnabled()) {
                continue;
            }
            
            if(!canFireInWorld(event)){
                continue;
            }

            try {
                registration.callEvent(event);
            } catch (AuthorNagException ex) {
                Plugin plugin = registration.getPlugin();

                if (plugin.isNaggable()) {
                    plugin.setNaggable(false);

                    Bukkit.getServer().getLogger().log(Level.SEVERE, String.format(
                            "Nag author(s): '%s' of '%s' about the following: %s",
                            plugin.getDescription().getAuthors(),
                            plugin.getDescription().getFullName(),
                            ex.getMessage()
                    ));
                }
            } catch (Throwable ex) {
                 Bukkit.getServer().getLogger().log(Level.SEVERE, "Could not pass event " + event.getEventName() + " to " + registration.getPlugin().getDescription().getFullName(), ex);
            }
        }
    }
    
    private boolean canFireInWorld(Event event)
    {
        // This requires a some sorting out
        return true;
    }
}