A quick look in dconf-editor and...
gsettings set org.gnome.desktop.file-sharing bluetooth-obexpush-enabled VALUE
Is the equivalent to 'Receive files in Downloads folder over Bluetooth', VALUE can be true or false
gsettings set org.gnome.desktop.file-sharing bluetooth-obexpush-enabled VALUE
Is the same as 'Notify about received files', VALUE of true or false again.
gsettings set org.gnome.desktop.file-sharing bluetooth-accept-files
is the same as the 'Accept files:' selection box, VALUE can be always, bonded (Only work for set-up devices) and ask.
Here is the picture from the other question in case you need it.
You can find what the current values are using get in place of set, To reset, use reset instead.
To list the available options:
$ gsettings list-keys org.gnome.desktop.file-sharing
bluetooth-accept-files
bluetooth-allow-write
bluetooth-enabled
bluetooth-notify
bluetooth-obexpush-enabled
bluetooth-require-pairing
enabled
require-password
Here also is a list with possible values in bold
org.gnome.desktop.file-sharing bluetooth-accept-files always bonded ask
org.gnome.desktop.file-sharing bluetooth-allow-write true false
org.gnome.desktop.file-sharing bluetooth-enabled true false
org.gnome.desktop.file-sharing bluetooth-notify true false
org.gnome.desktop.file-sharing bluetooth-obexpush-enabled true false
org.gnome.desktop.file-sharing bluetooth-require-pairing true false
org.gnome.desktop.file-sharing enabled true false
org.gnome.desktop.file-sharing require-password never on_write always
More can be found using man gsettings
Hope this helps ;D - Not as though I am doing this just because I use a netbook with a broken display for file sharing, for which this could be rather helpful...
As the above answer will probably only work if you have a graphical Gnome-based desktop installed, a simpler thing may be to use bluez as in the answer here.