Track lifetime memberships that never lapse using the membership management feature. This would let you can see whether someone is a lifetime member in the same places you'd see paying memberships.
"Add New" Option in Custom Data Dropdowns when creating a donation record
When entering a new donation, have an "Add New" option for the dropdowns like Campaign and Appeal. This helps streamline entry of gifts when for a new appeal or campaign.
Ability to replicate values from one custom field when creating another custom field
It would be very useful to be able to save lists that we could choose from when creating custom fields. For example, I will use the same list for "point of contact" in many different sections and custom fields. It would be nice to not have to type...
Create a note field for appeals and funds to allow users to add a description of the appeal/fund. This would be incredibly helpful for organizations with dozens of appeals: to add a date range for an appeal, to understand what each appeal is used ...
Having a default value for a custom field would allow for currently blank fields to at least have a value in them, especially if the value is mostly consistent across the organization. It saves time from having to always manually update a field.