Personally, I wouldn't put quick pins in either of these locations, but especially not the jib halyard.
Both the locations are high-stress points. Quick pins are not as strong as solid pins or shackles.
The jib halyard shackle in particular bears the entire load of holding the mast up when sailing. Failure would cause not only the jib to come down, but also the mast to fall back until it was caught by the forestay. A sudden shock load like that on the forestay could cause it to fail, and then the mast comes down. Even if the forestay doesn't fail, the boat is almost unsailable with lots of mast rake and a very sloppy rig.
I used to use a fast pin on my mainsheet, but quit after it kept snagging the traveler line. At least if that one breaks, it's not that big of a deal. You can jury rig the mainsheet fairly quickly on the water. I'd be more worried the quick pin would bend and I wouldn't be able to get it out.
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