Dr. M, your posts are confusing me, are you talking to me about the upmix clips or hairy_hen about his lfe?
Where do you get this about boosting the lower frequencies? Is the lfe at too high a volume??
The point about creating a 5.1 ac3/dts is that you can't use the dpl2 on your receiver on a 2.1 (93 dpl+h_h lfe) track, since it will override the lfe... And of course everyone are free to do their own upmix if they want/can.