Pluf,
I had the same concerns initially with the pacifier.. but ultimately, it was wotever works so that i get a decent night sleep (my bb was using me as her giant pacifier).

By and large, the pacifier helped my bb alot in forming her sleep routine because it comforts & relaxes her.
At this stage, bbs may be doing alot of 'comfort' sucking as well as using their mouth for oral exploration. It is part of learning... I do find as the bb is older, you can begin to distract them using toys etc because they are also more aware and have more interest/skills to manipulate them (hence decrease their need for sucking). From there, we can move on to other modes of self-soothing methods such as having a bolster, hugging soft toys etc.
Right now i am already starting to wean my ger off the pacifier once her sleep routine is more or less established. The last few nights, she managed to sleep on her own in the cot w/o the pacifier because she has gotten used to being in her cot and her body recognizes it is bedtime. In the day time, she will be sucking/licking/feeling with various toys or teethers. However, when she is cranky, sucking on something (be it fingers or pacifier) does help in calming her down.
Anyway, each bb is different.. even if she is sucking her fingers now, it is possible to reduce that gradually as she becomes more attracted to toys etc and when she is pass her teething stage. As of all things, consistency does make a difference.. so no worries la..