ChangeRoomFixedand hey presto! It's especially easy now that AGS has a find/replace in the editor now.
Probably CJ will fix this for the next 3.01 beta, but meantime you can use this module in 3.01 and 3.0. Full documentation is on my site.
By the way, this module uses the extender function ability of AGS 3.0 to make the new function look as close to the built-in ChangeRoom as possible.