TQ don't code in assembly, they didn't "change up the DS:[ECX+19] to ESI". They just changed the render loop so that the game FPS limit is now adjustable (it's not adjustable through the client options yet, though, I think) instead of being fixed, which in turn caused the assembly outputted by their compiler to be a little different.
I'll give you just a tiny hint, though:
Code:
Address Command
00635B24 MOV ECX,DWORD PTR DS:[0A9DAB8]
Hopefully, you can figure the rest out yourself.
Alternatively, you can use the "/SetFrame 60" command if you make an edited client with unlocked "PM commands".