There are certain things that are more important than others. But the values I change in SMBIOSResolver are the following that smbios uses:

Table Type 0 (bios):
version (MBP41.88Z.00C1.B00.0802091544) [SMbiosversion]

Table Type 1 (system):
manufacturer (Apple Inc.) [SMmanufacter]
productname (MacBookPro4,1) [SMproductname]
version (1.0) [SMsystemversion]
serial-number (SECRETSERIAL) [SMserial]

Table Type 4 (cpu):
external-clock [SMexternalclock]
maximum-clock [SMmaximalclock]

Table Type 17 (memory):
manufacturer (Unknown) [SMmemmanufacter]
memorytype [SMmemtype]
memoryspeed [SMmemspeed]
serialnumber (Unknown) [SMmemserial]
partnumber (Unknown) [SMmempart]
devicelocator [SMmemdevloc]
banklocator [SMmembankloc]

You should check if they contain a sane value, and if not update with a dummy value (what I have in parentesis is what I used). Except clock and memoryspeed, which should be calculated or provided from some kind of input file, for memory you could also make routine to read spd data via smbus, but i dont think that is feasible due to space. Serialnumbers could be made more appleish or just provide whatever is there.