I've not tested with mirror mode recently, but I haven't heard any users having problems with it, so I think it should work just the same as it does on SI.
Hey,
I was not aware of the existence of Giant Seaweed (I'm guessing it's a new item?), so unfortunately the script doesn't support it. It might be a bit fiddly to implement considering it produces a disproportionate amount of soda ash, but I will have to double check with the structure of the script.
Thanks for letting me know about this, i've added it to my list of things to add
Apa