Pre-Heat Extruder?
I wasn't sure how to title this properly. One thing I like to do to save time, which I don't believe is an option in Repetier (yet...), is to manually heat the bed, then manually start heating the extruder when the bed gets to about 105°. Then I hit start. By the time my bed heats up the last 10° or so, the extruder is just getting up to temp. It saves waiting a minute or two for the extruder to head up after the bed is already heated 
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It works great! The only issue I have with it is that when it runs M140 then M104, it only shows updates on the extruder temp. The be is increasing to 112° in the background, so it works as intended, it just doesn't update. I threw the extra M105 in there hoping that might do it, but it doesn't seem to have any affect. I'm ok with it as it, but if anyone has fix, that would just be the cherry on top
Some firmwares (or versions) only report the temperature of the device they are heating skipping the other ones so in that case you get no updates until target is reached. In this case it can not be changed except with fixed firmware on printer. If you disable M105 filter you would see that the automatic response is reduced to the heating device in that case.