Agreed with freyar here. The leaders with that ability can still improve their Cha through normal ability score increases every 4 levels.
Updated.
Only this...
This suggests superior low-light vision and/or darkvision as far as 200 ft. (Although I wouldn't go beyond 120 ft. like drow).
Do we want to do anything with the "night tracking"?
Ah, but in the original stats the plane-shifters seem to be no stronger in combat then the regular ranks, but were still respected commanders.
That ability was a standard feature of infravision in AD&D that was lost in the edition upgrade (just look in the 1E Dungeon Master's Guide).
So, if you give it to kobalts I'll start arguing you should add it to every 3E critter with darkvision.
Easier to just drop it. If you want tracking you can just have a kobalt with the Big Nose mutation.
I'm fine with a bonus on Diplomacy (or all Cha-based checks) against kobalts, just not a flat-out bonus to Cha itself.
Good to know. Let's drop the tracking bit, then.
Why don't we make it Su, since nothing in plane shift seems to depend on CL? If we go Sp, then we need to decide an equivalent spell level, too.
How about 2 ranks each in the four skills they have racial bonuses in and also Hide, Listen, Move Silently, and Spot? Ambush skills always seem good for kobold-types.
Point Blank Shot, ?