USB ports: HDD + stick? (HDD spin down)

Hi all.

I was just wondering if any of you guys have the following setup:
- USB stick with whatever extras you are using on the router (entware, transmission, AB-solution, DNSCrypt...)
- USB HDD for downloads/file-sharing...

I am thinking about making a setup like this, IF it would allow the HDD to spin down. I am currently running a USB HDD on the router with entware, transmission and AB-solution on it - the HDD does not spin down with this configuration.

If that setup will allow...

USB ports: HDD + stick? (HDD spin down)