Played yesterday with with shape files to create agn file (autogen)
All those apps are written in 32bit, so all input must be small, and thus time consuming :(
As for the scenery, best is to leave out the airports.
Locations and directions are wrong, so landing with ILS will make you crash
If you have mega airports installed, it's total nightmare ;)
Part from that, it's great to fly vrf now