Learning a new language

Our youngest son Connor has been speaking for some time now. It's not uncommon for children in the range of eighteen months to be speaking, but Connor has a word for everything. Which would be the main problem.

Dictionary according to Connor:

Aeeeehhhh
Pronunciation: 'Aeeeehhhh?!?!?!?!?!'
Function: noun, verb, adverb, adjective, preposition, conjunction
Etymology: Early Connorese

1: Anything
2: Everything

We tried teaching him some sign language because it's common to try with babies and they can often pick up quite a bit. For those of you who remember the signing in Meet the Fockers, quit squeezing your fists...

He learned the sign for "more" which is like pinching your fingers together in each hand and then clapping with just the fingertips. He kinda got that, but uses one hand with the fingers bunched together and the other open palmed. Not quite the signal, but close enough for us to understand.

After he learned "more" our learning progression pretty much stopped. Instead we get him having "Aeeeehhhh?!?!?!?!?!" as his all purpose verbal word, and now his "more" sign has become an all purpose non-verbal sign.

"more" = "do it again" (which I guess is about right for semantics), "Mama is home", "Papa is home", "Turn the TV on", etc, etc.

We continue to try to get him to say something else, but no luck so far. Sticking to our guns in trying to get him to say something to try to show him who's boss has no effect. He already knows who's boss and is perfectly happy in his role as the boss.