Replace EAxis. Nah j/k. But seriously, what will make this game better is that they should package an EP without any major (and stupidly easy to detect) bug.

I don't know if this is available with a later EP than I have installed, but as far as I know it's not; I'd love a Simlish radio station that your sims can listen to as a family in the evenings, or a morning show while they're having breakfast - so they can react to it and all giggle or something. I used to listen to radio shows with my mum and I think it's a really nice way to spend time with family!

Gradual pregnancies, definitely.
I'd also like to see a middle-aged lifestage perhaps [:

If custom content just had it's own section

I agree with this one. I'd like to see rabbits, reptiles, and spiders as pets :-) And the option to keep rabbits indoors or outdoors. Ponies and/or horses would be good too :-)

Aww, can you imagine the rabbit + toddlerness? Gah!

I couldn't agree more. Going from the youthful stage to a humpy, old age has always bothered me, not to tell how weird it seems -- to say the least. However, I haven't found anything about such a change even for Sims 3. Such a shame!

They are totally missing out by not including gradual aging or any different life stages. It would make the game complete for me