1) Yeah well nice theory but, creeps to near is not that good, it seems like you don´t have other place to put them wich you have, the area I marked is unused, just decorating, is a pity not put something usefull there. Maybe some trees to block between the mercenary camp and the green creep.
If I were you I would move them without doubt, it si not about draw other players or what ever theory, open creeps to near are not a standard thing and if you are a newby in wc3 or you click bad you can be pincered with that creep display.
This is my last attempt to try convincing you, your map, you are the boss, do what you wish.
3) about decorating rocks
my bad for being ambiguous, not that rocks, these rocks: