Hello Devs!
I miss an important Feature (maybe it was not on purpose) but it worked with Attract Mode 2.1.0(exe) very well:
Randomizing Videos or Boxart were i have diffent Intro Videos for one System or different Boxart for one Game/Rom (Europe, USA).
Example System Video: Atari2600.mp4, Atari2600..mp4, Atari2600...mp4, Atari2600....mp4
will randomize 4 System Intro Videos.
Example Boxart: Altbeast.png, Altbeast..png
will randomize 2 Boxarts.
BUT NOT ANYMORE with Attract Mode 2.2.1.exe