GTA San Andreas - Pier 69 in 19 Seconds
Updated run from my 44s pb. Basically re-worked the entire level to make every segment faster in some way.
I was able to use 1 satchel instead of 2 by placing a car on top of CJ's spawn point which granted me just enough height to trigger the cutscene. Thanks to Rhans' awesome new discovery ( • Making a vehicle immune to despawning (cle... ) I was also able to place a helicopter on the roof piloted by my polygamous girlfriend to help me blow up more enemies with less rockets.
For the killings of T-bone and Ryder I have placed duplicate CJ in a specific spot by the waters edge which allowed me to spray down T-bone with a minigun. Then by closing the food menu I am able to give fake cj the ability to use weaponry in the subsequent cutscene and blow himself up with a satchel. The character of Ryder is actually loaded in that cutscene and is just standing perfectly still which allows me to reliably kill him via detonation before the usual chase sequence begins.