usability ... make it not too easy

[volker01]

Hello Zenju,

i suggest to warn/ask the user if he do some critical actions in the gui.

Suggestion1:
Warn/ask the user : do really want to change the sync direction? yes / no.

Suggenstion2:
Filtering: Warn/ask the the user when he exclude all. (*.*)
that happend to me, i accidently do that (by copy and paste and tired).
FFS does what it should and there is no error and nothing copied ... ;-)