Again a feature thread which will be lost like tears in the rain (scnr )..... ..imho this game urgently needs a working design comitee (it exists, but..), and also someone (moderator) who bundles the community design suggestions/wishes in an official thread. Atm, its spread all over the forums, a real chaos.
Although they certainly add a new strategic depth I doubt it is a good idea to put stuff that is such complicated into a game like 0 A.D. This especially counts for the PVE part. I personally think there could be some additional depth into economy and decision-taking however. PVE would make 0 A.D. much more a kind of simulation (like Banished). Of course there could be scenarios that require a different style of playing (as they can technically add additional gameplay using triggers) or mods that could do so. For stamina I don't think it would be a good idea to separate the gameplay on small maps from large® maps. To summarize: I (personally) prefer the 0 A.D. vanilla game to be as 'clean' as possible. No (possibly) overcomplicated gameplay mechanics but more the kind of 'easy to learn but hard to master' style. (But it would be good of course to give mods the ability to add such gameplay of course). You're not the only one that wants this . I believe this is more or less planned for Alpha 18 ((in)formal?)