I'm glad you have brought this up, Vanyel.
I use the transcripts but only to confirm the lines, and I almost always type out the lines, (I can count the times I've cut and pasted with the fingers on one hand) it's why so much of the time my non dialogue material is more intricate and specific. I'll admit that it's bugged me when I've written up that and been outpaced by someone who cut and pasted.
I'm okay with cut and paste as long as it's not what someone does all the time. The fun of this for me has been typing in the lines and writing the non dialogue material.