Please let us select more than 1 month for Nitro Gift Subscriptions

For Christmas, I bought Nitro gift subscriptions for my server moderators. I like that we can choose between 1 month or 1 year, but more choices in between would be better. Can we please have an option to select how many months each gift subscription should last? If we can't select a specific number, at least give us the option to choose 3 months or 6 months for gift subscriptions.