Sounds like he is talking about adding a spoileron mix. You flip a switch and the ailerons both deflect upwards a few degrees to kill some of the lift and also continue to function normally as ailerons. This can also be mixed with the elevator so that when you input up elevator the ailerons also come up at whatever proportion that you set. I would not advise it though, its a real lift killer especially when the plane slows way down.

Its not really going to slow the plane down that much IMHO, but it will descend a lot faster as wing lift is decreased.

All of the symptoms you mention (ballooning, tipstalling) point to a tailheavy plane. Might try moving the CG forward a little bit. A larger prop with a lower pitch may slow you down a bit too. If you are flying too fast in general, this should help that as well.

Just some thoughts.