- use rate affix - i dont know. There are always several ways to fold item for all characters, and with each one then program treats a bit differently. Important parameter is "containerUnitType" and "requiredAffixGroup".
For example new rune daggers have set like unit type all three factions, so all affixes can appears on it. On Flameguards (both) is set "any", which may or may not cause a different program behavior. Required affix group is filter for some affixes. On Fawkes gloves is set to "253", for Chelsea gloves i turned it off ("-1"). Name of groups can be find out in affixes file, but connection betweem name and number is mysterious for me (TCv4 patch have for this completely new table). Maybe someone from old Hellgateaus community know about it more...
- critical chance on Chelsea Flameguards can be between 1-5%