3rd time posting, my posts aren't going through.

The messages posted in this forum are moderated to avoid spam. It was indicated after you posted you message but you probably missed the note.

There’s no easy way to configure the special settings of YafaRay renderer yet and you should choose the setting you want from the properties listed in YafarayRenderer.properties and set the Java properties at program launch.
If you want change bounces, you’ll have to set the properties [font=courier new]com.eteks.sweethome3d.j3d.YafarayRenderer.highQuality.diffusedBounces[/font] and probably [font=courier new]com.eteks.sweethome3d.j3d.YafarayRenderer.highQuality.lightingMethod[/font],
for example with Java options Setting these options depends on the operating system you use. Look at the FAQ about increasing memory to pick up the good option.