"This is the second incident that I know of with the Legacy canopy open in flight where the plane was pretty much uncontrollable in such a condition."

 

Were the two planes uncontrollable or uncontrolled.  The 360 is fully controllable with the canopy unlatched (forward hinging variety).  It is a non-event if, and this is a big if, you fly the plane first.  The canopy hovers cracked open about an inch and a half - much like the position in that takeoff photo of the Legacy that circulated after the Florida crash.  When the canopy pops open, it is very loud and very distracting.  Distractions have caused many accidents in aviation.  Lancairs are not unique in this regard.  Right before the Legacy crashed in Florida it slowed to the point that it was being over-taken by RVs that took off behind it.  A quote from this recent news article is interesting:  "...doing the best I could to get it landed in a hurry,..."  Why rush the landing.  Fly a normal pattern.  Another quote indicates the gear was not extended until very late.  I don't see any evidence pointing to the Legacy being uncontrollable give these two particular incidents, only that the outcome of the event wasn't good. 
Let's all be careful out there

Chris