Thankfully, 4e has really gone a long way in balancing stats so that just about any race can be boiled down into a similar template.
- +2 to one stat plus +2 to your choice of one of two stats
- +2 to two skills
- 3-4 minor abilities at least one of which is an encounter power, often one of the abilities will be defensive (bonus to saves, resists or defenses) and one will be offensive (weapon profs, attack powers), but not always.
I think of these minor abilities totaling about 1.5 to 2 feats worth of power.
+2 Dex, +2 to Con or Chr
+2 thievery, +2 Bluff
+5 saving throw bonus vs fear
*Kender Bag* encounter power
proficiency with staff, slings
Can shift through large enemies space without provoking AoO
I'm not a big Dragonlance fan, so forgive me if my Kender interpretation isn't perfect thematically, but I think balance wise that's about right. You could always give them an extra speed if you feel they are a bit underpowered.