I've been digging around the old RTW Demo rome.exe with an HEX editor and found quite a lot of stuff, mostly related to to all sorts of editing and overview tools that are embedded in the exe.
Even though the RomeTW.exe, RomeTW-BI/ALX.exe seem to give out less information, they too contain a lot of references to strat_ed and it's features.
The main proof of that is the huge amount of strategy map editor related options (and there's a lot more than just that..); and if they are embedded in the exe then there must be a way to enable it.
Apparently it looks for files in world/maps/campaign/custom/"mycampaign"/,
specifically for descr_strat.txt and for the first "campaign" entry followed by the campaign name.
It also seems to be able to generate most of the necessary files for the whole map and allows for almost complete edit of the campaign map.
Now, the -battle_ed command line option works quite simple (-battle_ed:trebia), but I haven't still figure out how to make the -strat_ed switch work. Perhaps it has been locked somehow and needs some other command line switch, or additional files.
I'd gladly hear the opinion of the community on this and their ideas on this feature. There simply must be a way to enable it.
There are also campaign map overview and model view tools, but that goes beyond the intended boundaries of this topic.
I'd also recommend visiting SigniferOne's ancient topic with command lines from demo exe.