when doing a side mod that will work on every land map, could one do each mission as a tdm even though there are not hero assault levels for each map? like will it know where CPs are and stuff? or could you just tell it to load the conquest CPs and not have capturable CPs?

Most of the maps dont have the stuff set up for hero assault but yes you could just load the conquest layer and make the cps uncapturable using something like this:
And you can get the cp names from the worlds in the assets.