T.,
Toddlers do different things at different stages...my son didn't start talking in full word phrases until well after 15 months, but was very capable of pointing and showing us what he wanted.
It can be very concerning when you're child isn't reaching the 'milestones' like we have read, been informed or think they should based on other peoples experiences. But, trust me it's okay. If he's talking and being vocal, then he's just going to be a different kind of learner and that is very important to recognize early on.
What worked for me early on, was realizing my son was a very visual and auditory learner. He listened intently to conversations and watched liked he was dissecting every bit of an action or motion...then, I found ways to play up on that learning skill set. Videos, walks, CD's and toys that empasize those learning modes.
It was amazing when one day my son spoke like he had been talking for months!!
I would embrace what he is doing right now, and work with him on exercises that emphasize using his hands...like peek-a-boo (demonstration and showing with his hands), clapping and singing together, practice saying 'bye-bye' to people when they leave the room (daddy, grandma, whoever) and I found rolling a ball back and forth did wonders for my son's fine motor hand/eye.
I hope that helps a bit...it sounds like you're doing a wonderful job!
Good Luck.