For me Dominions is a MP game only. I play SP only to test some things or play for 1-x turns to try out a starting strategy. For testing a save/load function would be ok, but i'm still happy to just copy the save game files.
I've some problems to understand why people discuss about a save/load function in prior of a better single player AI. I mean is it only me but i find it quite boring, the strategical AI doing always the same:
Make useless attacks against high province defence every turn. There isn't any visible difference playing against different nations. It seems they are all replicates from only one AI.
In fact its really impossible to make a good AI for such a complex game. But anyway they could improve it, make some different play styles, reduce AI bugs like not conquering neutral provinces, etc.
This would be a worthy improvement before we discuss a save/reload feature.
Thats my oppinion.