Not sure if this has been suggested before, but I think it would be a good idea to have different bags/satchels to hold seeds. There would be at least 7 different bags, to hold all the main types of seeds, split into categories like Allotment Seed Bag, Hops Seed Bag, Tree Seed Bag etc - they could be the reward for a new farming related quest. If you're carrying one of the seed bags, any seeds you pick up/buy/steal will automatically be stored in the appropriate bag. When you want to use them/sell etc you could right click the bag and the option 'Remove (seed name)' then type how many you want to take out. There could even be an option to plant the seeds directly from the bag. Just a thought to maybe save inventory space, particularly when thieving seeds etc and having a space taken up by a single seed :)