Quote Withwnar from the workshop: "Oh... I just checked the Kingdoms exe and those are in there. They are hardcoded attributes after all, not custom ones."
But they´re not used in vanilla kingdoms. I made a thread there to ask about these attributes. Link
The RBAI instructions say something like:
"3. Check if your EDU uses skirmish class, try not to use it for units other than gunmen\javelins\crossbowmen, guild's missile bonuses don't apply to them (still it's very useful for units that need a direct line of sight to shoot)."
Not not anything about those two attributes. Perhaps i´m blind once more...