2.In MTW 2 you can create transitions form shore to shore (those green double arrows), with this you could represent bridges and fords. But you will not be able to get roads to these transitions, due to hardcoded limits.
4. Yes. If you block the river delta and give regions at the river the opportunity to built special river-ships
5.IMHO that is a personal thing. Sure, you can never represent it historical right, but things like phalangites, recruitment and goverment system or minor factions are also represented how historical the engine allows it. AFAIK it would add a new strategic depth, both for human and AI.
XSamatan
PS:If you want to see how it works and try that stuff, Deus Lo Vult has navigable rivers....check it out
http://www.twcenter.net/forums/forumdisplay.php?f=309
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