Would be nice to be able to pack spoilage

Agree. I thought about it before. It is planned

Seems especially useful on your pelagos planet. It's a bit awkward that the planet introduces a new mechanic but doesn't allow usage with its own fruits.

it's not about allowing it.
Spoilage is property that can easly be unbalanced if you reset spoiling time by accident

so it was not added with launch of this mod

added in 0.7.0

can we perhaps get global multiplier for the cargo spoilage time? the reason for this is to help out with packing to not loose to much time and also logically I would assume that packing something up would make it last longer

No.
I want people to care about spoil time, and I don't like mods that remove or nerf this mechanic.

fair enough