I understand, unfortunately implementing features like explosions or ladders create so much work for Scirra as everyone wants to implement things like these slightly differently. It would probably be better for them to spend their time on things that cannot be replicated by events.
Regarding Flash, It seems to me that Scirra's whole business plan is that HTML5 will take over Flash fairly soon. It would not make sense for them to spend 6+ months making a Flash exporter, unfortunately.