Selective email syncing
We migrated from another CRM, Close, where we first manually had to enter a lead's email address, and then the email syncing kicked in. I loved the fact that I could work in my normal mail client, wherever I was, and did not have to worry that many of my unwanted emails get synced to the CRM.
It would be amazing to have an email syncing option where only the emails that correspond to contacts or leads are imported into Pipedrive. If the majority of what you do is not sales, but you need to be in sales conversations too, this is the best thing, as I use Pipedrive mostly for reminders and for checking reports, not as my main system.