those 00003000 codes are most likely pointers, you can find with exact and very good reversing and using math. someone has showed me that live. he has found the very same codes like usercheat did on a specific game.
he also told me it is most times useless, to make usage of mem dumps, as ps3 mem region gets changed everytime. though there are some nice tools, but not for us "normalos"
so we "just" have to learn harder ppc asm...
example taken from Star Ocean 4:
0x0026d4e4 blt cr7,0x0026D808
0x007AD0CC: E8E4FFF9 ldu r7,-0x8(r4)
0x007AD0D0: 38A5FFF8 addi r5,r5,-0x8
these three lines determine the memory area for a specific code. but don't ask me how to calculate with these given addresses. i still have to learn and understand things myself