Is it really true that the amount of dynamic lights is limited to 8 displayed at the same time?


yes, you can thank Microsoft and thier Direct X for that. nothing to do with engine

is it true that map entities, such as doors,lifts etc, arn't affected by dynamic lights?

yes and no. they are effected by dynamic flat lighting


how should it be possible to create a realistic looking game using the A6 engine?

just like its done in any other engine. planning and learning your tools and learning problem solving methodologies.