Balance storage between disk

I think it would be great to balance storage between folders on multiple disks in FlexRAID View.

For example if I have my videos stored in:
D:\Videos
E:\Videos

Instead of loading up the disk listed first as the View\Videos folder, why not have it balance the storage between the 2 disks. This does not have to balance the storage after it has been written like WHS DE, but I am thinking about looking at which folder has the smallest amount of used space and write to there.

That way it will help balance out the wear and tear on the disks and allow for higher I/O for items stored on separate spindles.

The trade-off is energy saving.
The FlexRAID storage pooling engine tries to minimize having multiple drives spinning just to read a single folder.
It also makes migration out of FlexRAID-View much simpler.
Further, splitting a folder across multiple drives won't give you the real world performance improvement you think it will since you are likely going to read the files in that folder in sequence.
I don't know of a single program that reads a folder in parallel. You either stripe the file (a la RAID5) or you don't.

I guess I was thinking at this from my perspective - virtualization. To help balance I/O. But I see your point, I guess in ends up keeping the total amount of disk revolutions to a minimum and therefore wear/energy.