Hi peeps, hopes for a little help

I have wired a momentary button (n/o) to an joypad so the button "replaces" the normal push from the joypad. I have assigned that key in a Racing game (GTR2) to Pit Speed Limiter. Can I with DigiSpark make 1 or severals (4/5) LEDs to flash when pushing the momentary button once(when activating pit limiter) and turn them off when pushing the button again? (Deactivating pit limiter) or di I need an relay or something?
Thanks
