it would be nice to disable the dot notation in some cases, for example in my system I have tags that have dots in the name and I can't increment the count.
also, mappers like mongoid use the atomic updates to save the new changes althought they use explicit object names (they don't use the dot notation I think)

see this case for example: (althought there are more cases)

http://github.com/mongoid/mongoid/issuesearch?state=open&q=dot#issue/290