'Irregular verb' sorting
I need more work on irregular verbs. Maybe you could add a 'select irregulars' in verb settings, with options for 'ir' 'er' 'ar' endings in spanish.

The “Essential Verb” list should cover all types of conjugations. If you nail down the essential verbs, the forms used in those apply to most of the irregular verbs.
Take a look and let me know.
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Don't forget, you can make your own lists and save them! (Options -> Verbs -> Save List)
Mostly, the idea was to let the user define custom lists. It would be hard for Conjugation Nation to create these lists, because there are so many potential categories.
Perhaps the feature to add here is the ability for users to share their lists with each other.
All irregular types are covered under the Essential Verbs list, and that was our attempt to define a list that meets all users' needs.
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Francesco commented
I like this idea. I would love the ability to study just the irregular Italian verbs such as porre, trarre and tradurre that don't end in -ire, -are or -ere. Thanks!