Ok that's fine I can add sub mods but at least add a chain for the emperor for kowtow to china.I'm aware that the legitimacy of various Chinese dynasties is a bit contentious (though Chinese history generally sides with Song), but we have to pick a side since we can't have it both ways, and even though the Treaty of Shaoxing was rather humiliating for Song they managed to keep most of their territory and even prevented (Jurchen) Jin from achieving their territorial aims (they initially wanted the border at the Yangtze), and from a gameplay standpoint it'd be mechanically inconsistent to treat that as (Jurchen) Jin being legitimized as the true China (and it'd also be messy to handle when scripting the historical war (which won't be modelled as a claim war for e_china)), which means considering Song legitimate seems like the better option.
Things would also get weird and messy when (Jurchen) Jin is destroyed (since the Mongols did that and weren't yet Yuan at that point), particularly if that happens during the game and Song pretty much instantly recreates e_china (I believe they'd have the requisite territory for that at that point) and gets an Unquestioned Mandate despite the Mongols holding a decent chunk of China, and there'd be gameplay issues for Song if they weren't e_china until Yuan destroys them (for one thing, vassals would get uppity due to not being de jure vassals) and potential issues with (Jurchen) Jin doing better than they really should (based on history) if they were e_china and got various benefits from that (de jure claims, being the Grace target, etc.) that they'd otherwise not have.
In short, I don't really see us changing (Jurchen) Jin to e_china and Song to a pretender as it doesn't really confer any advantages and comes with a bunch of drawbacks that can be foreseen.
I still don't see us considering a rework anytime soon, and it isn't certain it's something that'd be right for Tianxia or that'd work with Tianxia (particularly as we've changed several things related to the Grace system and at least a few of the additions might not work as offmap decisions).
The inspiration is sometimes pretty hard to judge, particularly as the modder and the devs could have arrived at something similar simply by looking at history, and I'm prepared to trust the devs when they say that they don't copy or take things from mods, which means they're scripting (and localizing, etc.) things on their own (which potentially could be similar to the mods script to an extent, seeing that there only are so many efficient ways to script something), so you're not paying for your own work but for their work. Also, the modding rules are pretty clear about mods and copyright claims (mods can't claim any copyright), the amount of any given DLC that's similar to a mod isn't necessarily significant, and, well, the devs can't be expected to be familiar with all mods or even all mechanics in more well-known mods, could potentially have decided to add (and potentially have gotten around to doing some of that work) prior to a mod having done something, and can't be expected to avoid doing something just because a mod got around to it before them.
Regardless, the modding rules, how PDS does DLCs or operate when doing something similar to a mod, and the like is pretty off-topic, so we'd prefer not to have that discussion here.
1. Event chains for Boons and Tributes are, again, likely to get annoying compared to straightforward events since you'll get them a lot if you're sitting on the Dragon Throne, and they're, again, not a priority. Also, the Emperor of China has a fairly good amount of content already, which means giving him more isn't a priority, and without concrete ideas that we like it's not certain it'll happen.
2. Palace coups seem like a mechanic that'd not be particularly fun (even compared to other ways of being deposed, such as factions) to deal with as the ruler if they succeed, and that'd not be particularly fun to use if they generally fail, so it seems prudent not to have them.
3. I already replied regarding factions, including there being ways to faction to overthrow the current dynasty if their Mandate isn't in a good spot.
4. To my knowledge, we've not made any DLC content available to anyone without the relevant DLC. If you think we have, please let me know which content that would be so that it can be investigated.
5. Any plots or factions that would mess with vanilla aren't happening since we're not messing with vanilla, any plots or factions found elsewhere might not be in the interest of the average player (or the Tianxia team) and wouldn't necessary be something we could add even if we wanted to, and we're not going to add plots or factions unless we've got actual concrete ideas for them that we believe would be good for Tianxia.