I know the load system but you actually can't change how they manage the load.
I'm looking for a system to let's user set the order by itself and by job.

Actually I use wardrobe and wardrobe 2 for my BLM, wardrobe 3 and wardrobe 4 for my PLD and swap in my inventory my GEO RUN MNK THF equip.

If I can load after zoning in BLM wardrobe and wardrobe 2 first then laid all others sachets that didn't affect the loading time.
Same for my MNK equip in locker
If I can use directly items from locker and load it first then all other sachets that didn't change anything on loading time.

So, allow player to use all inventory for macro didn't change anything if we can set priority for loading process.