well, even with an emergency beacon, your not safe in an instant.
theres still the chance that you are jumping right into the arms of some teleport campers, with 1minute of teleport-instability.
if someone can escape with the use of a mobile teleport, the roaming gang kinda deserves it (they can see the miner from twice the distance as the miner can see their scout)
dunno if buffs are removed instantly when teleporting, but if not, a "painted" target that jumps can be seen from nearly all over the island, so you know where he jumped off too.
so in my humble opinion, the emergency beacon doesnt need the 3minute deploy timer. even with instant deploy it would not be overpowered, it would just need a smarter roaming gang.
*Disclaimer: This post can contain strong sarcasm or cynical remarks. keep that in mind!Whining - It's amazing how fast your trivial concerns will disappear