Me and chris_m are asking for the ability to modify the incoming call display, while chris_m and CooL_HunK are asking for modifications to the call log and conversations list.

I do support your ideas, but have you checked out Extended Call Log, extcalllog? It's a bit clunky to access, but it shows at least the details of calls. Beware: 0.3 in testing is OK, but 0.3 in devel has currently some dependency issues. 0.2 in extras i OK, but lacks some features.