To give the fighters 255 seconds of time:

POKE 44793,255

This changes the value which is written to Time when a game begins.

44792	LD A,30
44794	LD (40101),A

POKE 44332,nn

This alters the check ("compare") for how many points 1UP has when a round finishes to determine whether the match is over.

44331

CP 4

POKE 44339,nn

This alters the check ("compare") for how many points 2UP has when a round finishes to determine whether the match is over.

44338

CP 4

POKE 36951,201

This changes the block of code which handles CPU scoring from:

36951	LD A,(43592)
36954	AND A
36955	RET Z

To simply just return.

36951

RET

POKE 44366,16

44365

JR Z,44369

TBC.

This changes:

44418

AND A

To:

44418

XOR A

TBC.