Make any joining member of a party auto-kick there hero's when they join.
Add a kick all hero's/npc button (less party leaders if possible, if not all hero's)
Give the ability to allow/disallow other members (all yes or no) to add hero's back to the party. 
I do love Hero's but would like to see more control by the party leader that's all.
                
            Party Leader More control over Hero's Joining
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EternalTempest
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Praetor
                    Well I don't see the point of needing the party leader to have dictatorship over the entire party. For one, taking a PUG-player with their heros contradicts the point of having heros in the first place. If a guild/alliance/friend is joining you, they should know, or you should tell them, to kick whichever heros in their party before merging.
                
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Tyggen
                    Just tell the player with the heroes "kick the heroes or I kick you"
                
            