Egypt has a completely different game cost model to Vikings and Japan. Charging for roads may work in Egypt as the coins aren't used for production, but what is the reasoning for charging for them in the earlier Settlements ? Is it just code reuse, which while laudable, is not really appropriate for such a significant change to an already released feature, even with a nominal daily increase in coins ?
Are you going to give us all time to test the play-ability of all 3 Settlements with several run-throughs before releasing to live ?
If you are going to insist on keeping 'paid for' roads in all settlements, what about giving roads the same amount of diplomacy as the 1x1 diplomacy buildings to alleviate to some degree the issues with reorganising to make room for diplomacy.