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A lot depends on how you define 'summon'.

If it's just an actor to follow and protect your party - there actually can be an infinite number of such actors.
They can be casted/summoned or generated else way, even many existing NPCs can be ordered to do so.

However as soon as the expectations raise, it becomes more tricky.
Should the summon be healable? Relay gained exp? Accepts buffs and pet auras? Interact with powers?

Actually, there is only 1 hard-coded 'summon slot' in DS2. Assumed now a summon power is selected, and if this slot is not filled with a valid summon, you can not even press the power button. :o
Concerning the time needed, I guess I would not add something like multiple summons again in a mod. To achieve (almost) fully-featured summons a large number of files had to be revised finally.