The more you get familiar with the game, the more drones you create. If they are about 10 or 15, it is simple to choose the one you want just using the slider, but it becomes more difficult as the numbers grow.
I think it would be nice to implement some directory/category/tag system to browse and filter your drones so that you can attach one or more tags to each one, or just put the drone in an in-game customizable directory (like if it was a project file).
In this way, if you want to scroll - for example - only your battle/race/sumo/etc drones, you can obtain this with just one click.