One thing I found cumbersome was rotating the initiative cards to indicate what actions had been spent. I had some custom poker chips made for tracking that when playing face to face, so I used the graphics from those to make cards in roll20. On the front of the card I put the "available" side and on the back I put the "spent" side. I set the cards to play face down so a player can pull them out of their hand and it will switch from available to spent. I'd include the graphics here, but I can't get the image insertion to cooperate.