That's an interesting idea actually...
I can't really think of any simple way of doing it the way you want using Construct.
I'm not sure how well masking would work the way you want... There is also the collisions issue to deal with... (actually, is overhead or side scrolling?)
As far as an IRC channel... All it would take is for someone to make a room for construct somewhere on freenode or rizon or wherever... Of course, it would be nice if Ashley approves and such...