You have it backwards. We have specifically made the rebels immobile through general traits to make them more of a challenge. In the unmodded game (and in most mods) the freemen will leave their cities pretty much ungarrisoned and roam around in pathetic small stacks that both you and the AI can wipe out with ease. The immobile leaders die out around 240 BC, and except for a few exceptions we don't recreate them. After their death the armies spill out in the countryside and all free cities are taken in short order. I haven't seen any improvement on this in M2TW, but I haven't played it much either.
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