PFB = Precious First Born the child you make all the parenting mistakes with. My first born has turned out alright though, despite what a nightmare she was as a baby.
Tatty - Entirely depends on how much you think it is worth it. If the bottle isn't that important for you, I wouldn't bother with the effort either. I have a big issue with needing my own personal space (silence and alone for at least an hour a day), which is hard when breastfeeding. The bottle is important for my own sanity, to get some space away from baby every now and again. I'm also not precious about DD having formula from her bottle, to give me a breastfeeding break.
Moose - We had to hold the dummy in place at first, until she got the hang of sucking it.
The dummy doesn't stay in the baby's mouth all the time they are asleep, only when they are dropping off to sleep. It will always fall out of her mouth as she drops to sleep because mouth muscles relax and baby will stop sucking, so the dummy would not be held in place.
If she's asleep then the dummy falling out doesn't matter, because she is asleep. If she isn't fully asleep then she will grumble when the dummy drops out of her mouth. So I need to be nearby to put dummy back. This is only usually 10 minutes or so until she is fully asleep and so doesn't notice the dummy drop.
If you have a baby that is easily disturbed and wakes easily - the dummy will become a problem because you'll be forever having to re-insert it. If you have a baby who, once they've dropped to sleep, sleep deeply and well, then the dummy is an excellent tool to calm, sooth and trigger sleep.