i think it would encourge people to create mini squads if you can create a party of 10 people instead of the 5 today, it would add more stratigic thinking, encourge people to interact with each other.
The commander could see all the groups that are on his squads (smth like group1-10 people,group2-5 people etc…) and will be able to communicate to each party seperatly.
IMO these are very minor changes that could add alot of fun to WvWvW