Beacons should just be the flat 30 seconds. Take out the 10 second grace period. Yes that will mean sometimes you see a bomb flying down and it disappears suddenly but 20 seconds is almost never enough time to root out a beacon, kill the SBH guarding it and then deactivate it. Its too easy to solo a building with a beacon.
Additionally I have a lot of trouble using the zoom. It spazzes out on me all the time from just one click.