Project Image and Simulacrum are very nice spells, tactically very strong, but I find that actually using them is a real nightmare. I have a party of six with three spell casters: Jan, Aerie and the protagonist. The three of them have both PI and Simulacrum memorized, and my original plan was to save those spells for the really tough battles. However, this has turned out not to be a very good idea. Casting PI and Simulacrum before battle means I go to the fight with six clones wich have the same name as the original caster (seven if I also have Minsc use the Gargoyle boots).
Just identifying each clone is hard enough. In the pre-battle buffing stage I have three dolls named Jan, three named Aerie, etc. It takes a rocket engineer to remember exactly who was casting what, and whether they have already finished casting and are ready to cast the next buff. Auto-pause is very helpful here, but even with auto-pause the whole thing is such a mess. During the battle itself things get even worse because of course some clones have their casting interrupted, others are dispelled, etc.
I'm wondering whether using these two spells is worth it. In theory they make my party much stronger, but in practice it ends up in disaster more often than not. It's virtually impossible to be aware of everything that is going on and I always end up realizing too late that the clone that was supposed to take down the dragon defence was dispelled before he finished casting Pierce Magic or what have you.
A mod that helped with the management of the clones would be very handy here, but I'm not aware of the existence of any such mod.