Roman Command Unit

I've just returned from the Partizan wargames show at Kelham Hall, Newark and managed to purchase this Roman command unit fairly cheaply. I'm considering splitting them up so I can base them differently. There are currently four figures on a rectangular base. Having seen some of the troops on display at Partizan, I'm also considering rebasing my un-based Roman legionaries shown in the previous post so there are more troops to a base so they look a little too uniform using the Games Workshop/Warhammer bases and not very realistic. The only problem I have with converting to say, two or three per base is the lack of flexibility it gives with changing formations, etc. Any advice would be greatly appreciated!