How about "dummy" batteries for the cordless products that have a built-in step down transformer and mains cord to plug into an electrical outlet for those times when being tied to an outlet is less important than continuous full power run time. Example: The Carvex would have the option to use batteries or direct plug in. Same for the drills, even though being tied to the cord wouldn't be as much of a real world benefit as for a jigsaw, but having a universal option might make it a possibility. Possibly other tools could be developed using this concept, like the EHL65 small one-handed planer in a battery powered/corded version, the DX93 and the RO90.
I'd also like to see a more powerful, heavier duty (less delicate), larger capacity Kapex and a specific spot on all of Festool's websites for consumer product suggestions and improvements, because not everyone is on, wants to be or knows of the FOG to give input. You never know who will come up with the next great idea. Yes, I know it will require extra work for some Festool employees around the world to sift through and deal with that information, costing the company money. Might be worth it, though.