Multiple mobs and Initiative

So the way initiative tends to work is that each player rolls a separate initiative and each type of mosnter rolls an initiative for that entire type. The reasons behind this are mainly bookkeeping ones. In a large battle where you are fighting maybe 20 guys that is a lot of initiative entries to track. Also you would have to match up for initiative entry to a particular participant instead of just having them all go at once and not worry about which entry matches which figure.

Well, finding the figure on the board the matches your data entry has become much more important given the number of individual effects. So I need a solution for this. I was planning on a series of lettered or colored tokens.

But this opens a new question. When the cost of tracking data entry to unit goes down would you want to roll a separate initiative for each member of a monster type?

PRO

• One danger in tactical battle is focused fire or multiple attacks done without being able to react. When all the enemies go at once they can basically unleash one massive attack before anyone can react. Interleaving actions prevents this massive build up of actions that occur without the option for attacking. In 4E this kind of thing is even more dangerous because monsters may have synergies or powerful encounter attacks that all go off at once.
• Like the above item, bunching the initiatives of a type can give them some options that players can't stop. A flood of minions can easily surround and flank characters who are even slightly over extended. They can also easily all move into position and then delay Going from being unflanked to having multiple enemies flanking you with some kind of bonus can again lead to the one super turn effect. Now, you could delay to get create this effect, but you would at least have to make some minor sacrifice to obtain it.
  
• Because the players know that a monster type goes as a group they can meta-game out the number of different types. In one encounter in Dungeon Delves that had a more powerful type mixed in among minions and they were supposed to delay their initiatives to match the slower group. So if you want to 'mix' groups you take an initiative penalty which seems stupid.
• This gives the option of having some units delay or ready and thus splitting the initiative. You could implement a 'splitting' function in the current tracker, but just having each monster having its own initiative order seems like a cleaner solution.
  

CON

• Tracking that many initiatives is a pain. Well, the initiative tracker with a few minor modifications can fix this problem. You just end up with a lot of entries and have to match the entries to figures on the board. See the next item.
  
• Tracking a data entry to a specific figure can often be a hassle. But it is a hassle that you really have to solve seamlessly for 4E anyway.
  

So in making this list of pros and cons I have convinced myself that IF you have a good system for tracking individual participants and for automatically doing bookkeeping (like rolling initiative for 10 guys and placing them in initiative order seamlessly), it is best to have a separate initiative entry for each unit in the battle.

So the steps I need to undertake are to modify the initiative tracker to generate numbers for large groups and label each group with a fixed letter and produce a series of easily useable tokens with letters.