You can very easily do it yourself on the device. I think the ability to still do that and choose whatever filesystem you want is MUCH MORE IMPORTANT than Nokia changing something that works pretty well _right now_.
I can do most of these now, in the 2GiB ext3 partition and the 256 MiB OneNAND. And if the sizes worry you, you can repartition, which works _better_ than the loop file. And you don't get to confuse users when they ask where their 32 GiB are.
Again, what's the difference between a 25GiB MyDocs file in a 27GiB ext3 partition and a 25GiB MyDocs partition with a 2 GiB ext3 partition?