Design School Project

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This is a bit random, even for off topic.
I'm a 4th year student studying Industrial Design at Auburn University and I'm working on a Keyless Entry remote that will have integrated bluetooth. I originally wanted to have a keyfob that could connect to your car stereo wirelessly. I also have considered having it report diagnostic or maintenance issues, but this is all brainstorming at this point.

I was hoping some of you (as car enthusiasts) will have good insight and suggestions.

What complaints do you have with current keyless entry remotes, and what additional functions might you find useful in your keyless entry remote?

Consider:

Materials
Form Factor
Buttons
Texture

Any input is welcome and greatly appreciated.