That would be pretty neat. And they could have like cool little news clips that tell you what's happening on the planet, even if it's just little IC fluff stuff.
At the guild summit they said originally your companion used to ride with you. This is why the larger taxis have two seats. However once they started introducing non-human companions it became unrealistic to do so the feature was pulled.
Spreading email?
You keep using that word, I do not think that means what you think it means.
I think the word you are looking for is "persistent". And there is a really good reason there is no persistent email, it would be used for storage.
Making them clickable is what would really ruin immersion.
These NPCs scale based on your PC performance.
My PC is awesome, yours sucks. I start interacting with a clickable fluff NPC, you see me interacting with thin air.
Your immersion, ruined it is.
Well make up your mind then. First you say they should be "click-able" (which adds nothing to immersion), then you said they should be interactive.
So again, how does simply being able to click on them add to immersion? Do you like, walk around in RL poking people? That's the best RL equivalent I can think of.
First of all, how does being able to click on them increase immersion?
Secondly, there are lots of non-interactive npcs that move around. Not sure why you think they do not move.
Better solution: Simply auto-dismount you when you talk to a vendor, use the bank or GTN, etc. This way you still have the speeders to get around quickly, but they are no longer piled up on top of the vendors, bank, etc.