John,
Those restrictions are part of the original procedures developed prior to fully investigating the Osprey's relationship with VRS. In the Osprey, if one rotor goes into VRS, you get massive roll. In a twin rotor like the CH-46, you go end over end. Since then, and with the flight envelope testing they should have done back then, it's been found that the V-22 is less prone to VRS than most conventional helos, and more importantly is easier to recover (you blip the nacelles a few degrees and the proprotors are in "clean" air and out of VRS). They've also put a VRS condition warning on there which the crews consider more of a distraction than an asset. My understanding is that when an actual tactical situation requires it they do exceed that limitation. V-22s also do put out a bit of rotor wash, which unlike a conventional helo in forward flight, goes aft, not down. This is why there is a limitation of 250 ft. cockpit to V-22 ahead or avoid a 30 degree bearing off the tail when flying at same or lower altitude when within 250 feet. That's why you rarely see them fly in trail. It's not dangerous, just different.
In any case, the two questions you pose are specific to the V-22, its size and its less than optimum disc area (imposed becuase of the shipboard requirement and other original JVX specifications when they tried to make it another F-111--all things to all people). They are not a function of Tilt-Rotor technology itself. JMR/FVL is for a smaller, and more agile vehicle, so it's not likley that those procedures would be required.