Ok first of all i have tried to give this ability to the Goggles but i failed.
I tried to do it as a useable item, that when activated it would track all enemies for 10 seconds. I simply copy/pasted regulus's tracking bug skill, and i made the neccessary changes. it didnt work. - To be honest i didnt spent a lot of time on this. Just 15-25 minutes. I should have given it a little more time, i think i can make it work.
Anyway,
I think your idea is better and simpler, but if it works this item would definitely be OP.
An answer to your question:
-1 means infinite, and i think this would cause problems, since Auras are not supposed to have this value (-1).
But it may work. Still it would be a lot better if you simply set it to 5000.
5000 yards range is the range of Teleports, Cloak of Night, Amulet of Teleportation, and other items that have the whole map as a range.
5000 covers the entire map, you can use it safely.
The AuraPulseTime is how many seconds each effect stays on you, when you get out of the Aura's range. Since you plan to have it cover the entire map it is useless, leave it as it is, or remove it. It doesnt matter.
Hmm... what else? Any other questions? 