amundsen:
I understand it's important to have a star grounding scheme to avoid ground lifting but in other situations may I daisy chain components or should I avoid it too ?
Daisy chaining the ground side of lots of push buttons is OK, also for a string of LEDs it shouldn't be a problem. It's high current drawing devices and anything wired to analog input pins that really should have separate ground returns to a single 'star' point in your power distribution system.
Lefty