Simplified Initiative Tracking and Special Initiative Actions
This is a slightly simplified way of handling initiative. Basically, it drops the actual initiative count numbers and simplifies things to a pure order of actions. It's the way I ran combat with my tabletop group when I was DMing, albeit refined a bit. I still haven't figured out how to handle new creatures joining an encounter in the middle yet, unfortunately.
Once an encounter starts and initiative has been rolled, drop all actual initiative counts. Make a list of all combatants in the order they act, plus the special initiative marker indicating the start of the round. Whenever an effect with a duration is produced or anything else that requires tracking time from round to round happens within an encounter, add an initiative marker for it to the initiative list.
To actually run this, just make a list (actually a queue, for us computer science folks), starting with the start of round and continuing with all combatants in order. Start from the top of the list. Whenever a creature comes up, it takes its turn, then cross it off and write its name at the bottom of the list. Likewise, whenever a special initiative marker comes up, do whatever needs to be done for that event, then cross it off and rewrite it at the bottom of the list (unless it's an effect that's ended, in which case you don't need to keep tracking it).
Delay: When your delayed turn triggers, your place in the initiative order moves to immediately after the event that triggered it. If multiple creatures delay in response to the same event, make opposed initiative checks to determine the new order.
Ready: When your readied action triggers, your place in the initiative order moves to immediately before the event that triggered it. If multiple creatures ready in response to the same event, make opposed initiative checks to determine the new order.
Moment of Alacrity
Diamond Mind 6 (Boost)
You can improve your initiative count for the next round and all subsequent rounds. When you initiate this maneuver, your place in the initiative order for the subsequent and following rounds moves to immediately after the start of the round.