Hi,
If it doesn’t bloat turris kernel, please activate cfq on kernel io schedulers. No need to change the default io scheduler.
It is very useful for external hard disks (rotational) where competing processes try to access the hard disk. Also, if you can please activate ionice in busybox so the tool can be used on the host as well.
It would help on scenarios where the turris acts as a small file/media centre.