It never hurts to ask, however, I find the answers usually create some ill feelings.
Your cargo holds are designed for the races/classes and by doing what you've asked, it would effectively give you more space to hold things above and beyond your cargo capacity. This would also open up a whole new can of worms regarding stack sizing of ores, components and a multitude of other things.
In order to keep the balance, this is likely not going to be something that will be addressed.
I will, however, reserve the right for this answer to change if directives are changed.