I just looked over all the shrines on the wiki, and noticed this too. I thought "shouldn't Mephala give you a sneak boost or something?!" And here you are!
Another modder, Venvin, if I'm not mistaken, within the past week, did a similar mod that made the enchantment grant a hefty +10 to two-handed weapons skill which goes hand in hand with Mephala's Daedric artifact weapon, but I'm liking the thought of this mod, too. Now I'm stuck deciding which one to go with.
Have you considered making it fortify pickpocket instead? The reasoning is simple - think of the thieves guild initiation quest. You're supposed to steal a ring from Madesi and plant it on Brand-Shei, to frame him for the theft. That's certainly in Mephala's sphere - lies and deceit. Additionally, pickpocketing allows you to assassinate people by planting poisons in their inventory, which covers the murder aspect. All in all, it seems to fit Mephala better than even Nocturnal (who, while patron of thieves, definitely does NOT encourage poisoning people to death on the job, if you recall how harsh the TG rules were in Oblivion).
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And here you are!
Plus, God knows Pickpocket needs more love...