Gameplay Experience Questions

A few questions in case anyone has answers:

-Why do other Roman family diplomats visit my settlements, even from early game, and constantly gesture for opening discussions (though no dialogue box ever opens and nothing seems to happen)? They will often repeat this action turn after turn.

-How are wardogs used effectively? Do dead wardogs return after a battle, so long as their handlers were not killed?

-What is the 'Military Access' option for? I have tried offering this a few times with other diplomats and leaders which I thought would be a bonus in negotiation (them, having military access in my territories) but they often react negatively and it destroys the entire negotiation, and other offers on the table.

-Sometimes factions won't like Map Information requests...if they have no map info to offer, is this why using it in a negotiation (on top of many other current offers) will auto-fail the negotiation?

-Does having too many mercenaries in an army or city impact anything, like unrest?

Thanks folks! Appreciate your help!