I just changed do_look and do_who to function properly with the pager system, and I noticed something very annoying to me.

When you have your pager active, and you look in a room, there is a brief pause in the output after the room description is given to the client. This might not technically be a bug, but I am very annoyed with it. Does anyone have any clues as to what causes this brief delay? I also noticed that there is a brief delay before the prompt displays on commands when the pager is active.

For now, my only solution is to leave the pager off, but force it on in certain commands that (may) require it, such as who list, rlist/olist/mlist, etc.

I am unable to duplicate the delay you speak of having modified look to make use of send_to_pager.
I added 1700 characters to some room and had to press enter to continue, the prompt never was delayeed in moving around Honoghr.