Some of my favorite scenes are the ones where the women direct themselves (usually where they push themselves extremely hard in the scenes). I'm only aware of a few, but I must be missing some:
Alexxa Vice - She Directs her Own Scene: Alexxa Vice, 4on1, ATOGM, DAP, Milk Stuff, Gapes, Wrecked Ass, Almost ButtRose, Squirt GIO1798
Pretty straightforward, Alexxa directed this one.
Anna De Ville - A librarian in the bus wet, Anna de Ville (self directed) 9on1, ATM, DAP, Gapes, Monster ButtRose, Pee Drink, Swallow GIO2282
This is Anna's self-directed scene I knew off the top of my head before I found the others from searching.
Anna de Ville directs her own Fantasy, Sleep Fantasy with Balls Deep Anal, DAP, Gapes, Squirt, Monster Gapes GIO1752
I didn't know about this one before today, but looks like this one Anna directed, too.
Anna De Ville - The 50th scene #1, Anna de Ville wrote the script and we shot it. Rough Sex, Gapes, Pee Drink GIO1225
Anna wrote this one, but didn't direct it I guess? Still interested in these. Has a Part 2 also.
Suzie Q - Nympho Rough - DP, DAP, PISS, SPIT - Piss Version SQS001
This one came from the description, not the title or credits, it says "This is my first scene as a producer and where I direct myself in the dirtiest and most perverse situations"
I found a thread that talked about Proxy Paige directing some stuff, but it seems like she was behind the camera from what I can find.
Ideally I'm looking for rougher, gangbang/orgy style scenes with lots of anal/piss/puke, but curious if anyone knows what else is out there! Doesn't have to be on Pornbox, but the self-directed stuff I mentioned above is definitely the kind of filthy/rough stuff I'm wondering about finding more of.