This is a really noob question, but can you have multiple copies of the same agent in play at the same time?
(i know you can have 3 copies of each card in a deck)
(gameplay wise i think you can, but thematically i thought it was weird, having like 3 mr syndes working for you at the same time)
Also, are there any rough guidelines what is a good ratio of agents/gear/action cards in a deck?
To answer your first question, yes you can have up to three of any non-unique Agent card in play. Also, the Shadow Patriots Agent Lt. Folley was ruled to be considered Unique.
As to ratios, it's dependant on Faction and theme of the deck... Nine Tigers would be gear heavy to arm their warriors to the teeth, while a Franchise deck might be Action heavy to represent their wicked bag of tricks. It's all dependant on what you are going for with the deck.
There was a general ratio of 20 Agents, 20 Actions and 10 Gear floating around but was only used as a template and tweaked heavily to fit faction and style of play.
Hope this helps.
Ashes to ashes,