Preferences: stray check buttons?

[R. Lahaye]

Hi,

The Inputs-tab in the Preferences dialog has two check
buttons that seem to me as stray buttons:
They're both on the left, at the same level as "Temp dir"
and "Backup path".

If these buttons dis/enable the use of the Temp-dir and
the Backup-path, something should at least be greyed out
when unchecking them.

As it is now, these buttons seem not to have any purpose.

Regards,
Rob.