Some Ability Ideas for ADC's

Basic ability. Dash a medium distance and during the dash, click on a target for an empowered auto attack. Fairly long cooldown but auto attacks against enemy champions will lower the cooldown.

Basic ability. Several "platforms" appear on the walls in fixed locations from the start of the game. Activate to climb onto the platforms via grappling hook, etc. Bonus range, attack damage, armor, and magic resist on the platforms.

Passive. Each spell cast grants a stack for a few seconds. An auto attack consumes the stacks and deals damage depending on the amount of stacks stored. (For a bursty kind of play style.)