Buckle in, this explanation's gonna be a long one.
Gonna add info to this with what I know as a Modder.You are right about the rework and some problems.
-1st ,Correction to the limit of a object* in any place,cage,/race/monster doesnt matter much,about the movement.(well it take me 4 days to fully rework 50% of the limitation,in my setting,private estate player can go practically anywhere.like seriously.
You wanna go breeding room?sure.
Maybe creating 8 of you and just go touch* while looking at some girl giving birth?or go management brothel block clients?sure.
prove
-THE PROBLEM
as you noticed the sxx animation is correlated by place,target&many other small variables controlled.
1.Like You would normally expect any male sxx with any female right?Since,player can go brothel as shown above?NOPE.
2.ALSO,I have seen MANY MANY MANY sxx scene where I just see the background.
Why?Lack of animation and I assume they just go to sxx in other dimension.
3.To addon location dependant,BUT,somehow tentacle will practically fk any girl
4.Modding new anim is fundamentally limited due to above reason and trust me even looking at the code extensively.You can only find hints to what could get it working.But not sure.and by not sure. You should be expecting 1-2 week dev time for a single animation until the modders have figured out and share the ways to do it.
5.Fixing the fundamental problem.The animation logic system is created to be like an automated sxx factory(*if you know what I mean with these hints).
-automatic water tap.just put your hand close and water out.
-automatic sxx,yeah just drop and they sxx.
These as you can see is a very very very simple mechanics as a user.
However if you add futa,who to who?style?etc.
If you answer two or more of these question.and think you have solve it.YOU ARE IN FACT VERY WRONG.
A simple usage system will make ANY future extension MUCH MORE HARDER.(and I bet most would expect to have changable sxx position a thing in future.At least I do*)
flexible things are generally never simple.
- like how modding a game,etc. Is it very easy to code?I think no it need experience,etc..
So,to fix that fundamentally we must give user a way to pick/control.Like how much,which position etc.
-known solution,
1)we just somehow use unity mod this.instead of manually finding variables.Because as far as I know dev in Unity has very very good support for spine including auto-suggestion.(and any good dev knows a good auto-suggestion can save you a looott of time)
2)give modders a shxt ton of animation&time&money? Then custom animation&futa&rune h will be real very fast.