Just so we're clear, it's 4.2V per cell. I wouldn't recommend charging to 4.6V. Might not do anything bad, but who's gonna go out and try it?

The thing to keep in mind here is that even if the motor is off, the ESC is still draining power. So are the receivers and servos. You can't unplug the battery because the plane's in a tree. When you get your plane back, the pack will be pretty thoroughly drained. A NiCd or NiMH pack might be rechargeable, but the LiPoly is almost certainly going to be down below 3.0 Volts per cell "safe zone," and probably below the 2.5 Volts per cell "serious damage" line. It may be possible to recharge the pack, but it will only be a shadow of its former self, and there will always be a shadow of doubt looming over its stability. If it were my pack, it would "sleep with the (salt water) fishes" tonight...