You can buy a Starscan (Chrysler is more than happy to sell you one), but it's way more cost effective to pay the $30 or $40 to the dealer when you need something activated. Especially if you can do all your mods in one go. If your dealer's friendly, you can probably even convince them to roll it in for free at your next service.
OBD code readers aren't the same thing as a Starscan; all they can do is read out engine codes and maybe give you engine sensor data.
2006 WK Laredo 4x4 4.7L
1993 ZJ Laredo 4x4 4.0L — Dead, sold, and rolling again