Pdf export that retains the grid layout (maybe even being able to decide how many rows one wants. Otherwise three rows)
Feature suggestion: Being able to temporarily view the blocks of a channel in another order than what the channel owner(s) made. Two suggestions for orderings: 1. Some T-sne-like algorithm (at least for visual material). 2. Random.
Maybe it could be nice as well, as the owner of a channel, to be able to "save" such a generated ordering temporary as the new default order (and then be able to do further reorderings again by the familiar dragging from there)
Feature suggestion: Being able to set a channel to a mode where everyone can submit suggestions for blocks/connection, but only have those appear that have been reviewed and approved by the owner of the channel.
Ability to give view-only access to private channels, including being able to do that through a secret url (so that a private channel can be shown to someone who's not an are.na user)