It would be nice to be able to filter subscriptions i.e. the content you will get shown in your subscription timeline for each single tag. Basically when subscribing to a tag you can choose from which category you want to get walls from. You also should be able to re-edit that filter whenever you feel like it.
I really like anime wallpapers and have subscribed to a lot of tags. Some of them are general like skirt pantyhose or scarf And whenever new wallpapers are uploaded with these tags included, 90% of them won't even be anime related and won't fit my interest.