This is a list of possible enhancements opened in GitHub, but not being actively worked on. These are all good ideas. If you are thinking of helping the Arcade library by working on one of these, please re-open the issue.
Issue 291 Load a spritesheet with a texture_region map.
Issue 377 Support basic sprite animations like rotate, flicker, disappear, etc.
Issue 380 Add ability to specify a point the sprite rotates around.
Issue 419 Create function to get sprites at a particular point.
Issue 498 Add lighting effects.
Issue 523 Add sprite trigger/example for onenter / onexit.
Issue 289 Be able to get Sprite position and velocity as vectors.
Issue 332 Only so many textures can be supported when drawing a SpriteList. Support more by better packing of the auto-created SpriteList.
Be able to load an animated gif as an animated time-based sprite.
Be able to load an Aesprite image directly (Piggy-back of Pyglet support)
Issue 452 Documentation Request - explain how delta_time works to help learners fully understand both how and why.
Issue 543 Documentation Request - Improve documentation around installing on Raspberry Pi.
Issue 408 Documentation Request - Explain border lines that can occur when drawing sprites, and how to avoid.