Ah, well. I didn't notice the unlocker. Sorry :)
However, I've installed your mod on a fresh GAMMA installation without anything changed so far and started a new game. Weird enough, the backpack and grabbing anims were enabled. I just had a look at the mcm script file, that comes with your mod, and noticed, that these options are intended to be disabled by default. But if I'm not mistaken here, the "true" boolean in these options seems to disable them (so, they're somehow switched. Didn't check the fdda script, where it's defined). Maybe that caused the confusion.
manzmnl
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