The idea of a consumable to use for managing belts is interesting. IMHO, shrink-wrap items shouldn't be able to be moved by robot. So, I hope you've set that.
One thing though, unshrink-wrapping a thing should produce waste shrink wrap. It would make sense to not be able to use it again. But maybe it should create lots of extra pollution or something like that? Alternatively, it could turn into heavy oil. It should be about 4 heavy oil, which (if you count the coal put into the plastic as being subject to coal liquefaction) is about 4/5ths (slightly more) of what you'd put into making an item of shrink-wrap.
While I think the pallets mods are overpowered, because they wrap up too many items into a single thing, I do like the pallet management aspect. It's an additional puzzle and concern with various tradeoffs when designing a factory that uses pallets.
OTOH, the idea here of having shrink-wrap be consumable introduces a material cost, which is also interesting. Having the unshrinkwrapping process produce a fluid I think makes for an even more difficult challenge, and a more varied suite of ways to handle it (my flamethrower turrets are powered by the waste shrink wrap from my factory). And even if it produced a full 5 heavy oil, you would still be losing the coal no matter when you did.
