Other suggestions;

One thing I would love would be the possibility to play different campaigns (possibly with different victory conditions), IE starting at other dates than 272 BC. Possible start dates could be:

264 BC 1st Punic
218 BC 2nd Punic
201 BC Macedonia and AC allied against Ptolomai, Rome on the verge of entering the fray.
~110 BC, Numidia, Pontos, Germans all flexing muscles.
59 BC, First Triumvirate expands Roman dominion, Germans threatening the Averni/Aedui, the latters' last chance of nationbuilding.
31 BC Augustus, can Germans and Getai resist? Ptolomai remain independant after Actium? Parthia beat Rome in the East?


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New factions would be nice as well, though I am aware there is no room.

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Civil Wars, like in BI or possibly even with playable rebel factions.

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City States like Massilia and Syracousai, Pergamon, Cyrene and even Ptolomai Egypt changing from Rebel/neutral to Allied/Buffer/protectorate state if neighbouring faction is powerful enough.

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Enforcable Peace, Second Macedonian War came about because Philip IV refused to cease hostilities against "Konion Hellenion" (sp?) and Ptolomai. Gaius Popillius Laenas drawing his circle in the sand comes to mind as well as being the most famous enforced peace ever I think (you gotta love that incident. That is confidence in one's own power and power politics for you).

As you can see I am Roman-centric, others may have other campaign suggestions as well.