Hi there K-U-D ( ) and welcome back ,
Acoording to this article :
By setting the bit type to DVD-ROM instead of DVD+R the DVD player is fooled and compatibility is enhanced on many DVD players.
In other words : Every dvd+R that you write suddenly acts as if it is a DVD-ROM ("Look at me ! I'm a pressed media and was sold in a normal shop ! I'm a movie !). Some standalone players are more compatible with DVD-ROM media than DVD+R or DVD-R.
If your standalone devices don't have any problem at all playing your media , there's no need to set any bit.