Custom-sized persistence storage for Tails on USB flash drive

I've been trying out tails on a USB flash drive. By default, when I create the persistence storage, it fills up the entire remaining space of the flash drive. This basically makes the flash drive useless for any "typical" usage, i.e. a simple, cross-OS storage device, because the encrypted storage is a pain to mount in many OS.

What I was hoping to do is:

• install Tails on the flash drive in it's default FAT32 partition (the installer does this automatically)
• create a partition with the persistence storage that doesn't fill up the drive

I can't pre-create the partitions as far as I can tell because the Tails installer will wipe everything. I can't resize the persistence luks partition because gparted and other tools don't seem to support it (yet). I found some command line instructions to resize on the command line, but the process was very complex and frankly quite scary.

So, to the point: how can I create the persistence storage with a custom size, or are there clear instructions on how to resize that partition?

Thanks!

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