1) No. Or well...maybe. The proto triggers are in 4.12. Look
http://forum.1cpublishing.eu/showpos...7&postcount=17
Arty spotter plane linked to guns is almost a triggered function. And it s the start to more features. Maybe more could not make it in 4.12, but will be in 4.13. FC99 surely has a answer.
2)If I undderstand correctly your question, Not the same map, but the same sim version. If you host a mission, the .mis will have all the base items. and the map itself. Technicallly the [house] will be loaded by the guest. Obviously spoken that the same version of the sim is used.