Hi Parduz, welcome to the forum
If you want to change the Default Action, open the Avast! GUI and go to : Real Time Shields - File System Shield - Expert Settings - Actions , where you can configure it to your needs. Personally I use : Ask - Move to Chest - Delete for all 3 detection options, Virus, Pup and Suspicious.
You can configure Mail -, Web -, P2P -, IM - and Behaviour Shield the same way, although Web - and Behaviour Shield have some different options.
Greetz, Red.
Edit : Lol danny96 edited his post, when I was editing my prepared post