Configuring root drive with flash memory plugin

Hi everyone,
I'm glad to be a new member of your community
I recently build my first NAS with a Q1900-ITX board, a 12V-8A picoPSU, 4x 4To WD blue HDD (using idle3-tools to disable head parking) and recycled 4Go ram from old laptop.
I've made a ext4 partition on top of luks encrypted RAID5. Openmediavault seems to work like a charm, I think I'm going to adopt it

Since I've decided to install the system on a USB key for now (maybe I'll upgrade to msata in the future), I wanted to install flash memory plugin.
I've done the manual modifications of /etc/fstab as adviced by the plugin.
I rebooted without problem, however I'm not sure it's well configured :

The plugin configuration page give me "root : /dev/sda1" but my root drive change to sde since the installation.

Is that a problem ? Is there a way to manually change this configuration ?

Thanks for your help

Thanks ryecoaaron for this quick and comforting reply.
I 'm not yet aware of the details of your plugin... for a better understanding what do you mean by the "data written display" ?
Thanks

Edit : I've edited /etc/openmediavault/config.xml as you suggested, and after reboot "root" is "/dev/sde1" and "write kbyte" seems now activated. Good... even if I don't know what it means

OK, thanks !
So I guess few Mo everyday is great for saving my usb key lifetime.
Thanks for your work.