Linux: in the hidden folder: ~/.avidemux6/custom create these folders (could be any name you want)
In these you can copy your saved/edited projects of repetitive settings you need to perform like these 2:
ac3T2toT0: dolby track from track 2 to track 0, most of German satellite FTA HD are like this, except phoenix.
3satHDac3: similar as above but has has 4 audio tracks instead of 3
After avidemux restart these are now available in avidemux main menu -> Custom
see attachment below
Windows: something similar should be possible in %APPDATA%/avidemux6/custom Still need confirmation this is the correct folder