Bitdefender Settings Question

For those here who use BD Pro 9 is it best to leave the settings for the virus scanning engine to default or is it better to tweak them. Also what settings would you reccomend.

 

for the option "Do not scan files bigger than [xxxx] kb. id disable it or put 0, i forgot which makes it scan all sizes.

i think BD scans all files by default so there shouldnt be any other settings to change.