Chuck - if i remember correctly (my bike is now up to about 7,000 miles so this is no longer a problem) I found that I only needed to make an adjustment of about half a turn when the engine was warm, to slow down the tickover. I thus got into the habit of turning the screw in half a turn when starting from cold, then turning it out again later (whenever I happened to stop and so noticed the increased tickover speed).
As the engine freed up, I found that my cold-start tickover was getting too fast, so I backed off the screw a bit, and eventually found that I could just leave it in that one position all the time. The warmed-up tickover was no longer noticeably faster than the cold tickover.
However, all bikes are different so even when run in, there is nothing wrong with turning the screw in a little to get an easy cold start, and then turning it back again as soon as you have a steady tickover. That's what it's for, and that's why it has a knurled screw rather than a screwdriver slot.
(At tickover, my ammeter needle is more or less centred, as you suggest).
Tom