Additional contact card fields and/or allow for custom field generation: phonetic first, last, middle name, hobby, interest, manager, etc
Implement additional fields in the contacts web app. See some ideas within the vCard page on wikipedia and its extensions. Some that I personally like are phonetic pronunciation of first, last and middle names, hobby, interest, etc.

Thanks for your suggestion! This is in fact planned.
Just to clarify: We already support all custom properties you can think of – it’s just our contacts web app that is not showing all of them. If you have clients that support them, we’ll of course sync everything.
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Alexander Koster commented
Thanks for your prompt response. I will be looking forward to this feature being implemented for the web app. Will try to add other fields on the client end in the mean time. Keep up the good work!
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Alexander Koster commented