@secco, 1 experience in the mod = 10 experience in the original game.
If you think the rewards and experience for stealing aren't worth 10 OP, you can steal with Corrupted Berry... or not steal at all.
There are no changes planned for pickpocketing in the upcoming versions.
There are no bugs in the script for accruing experience for pickpocketing, it works as intended. There is a small randomizer that can either increase the experience for stealing or leave it unchanged.