Bruce, I've developed a new and speciol (with an "ho") hatred of creepers, and have implemented my patented "Drew's Chickenshit Mob Killer" - which is like the cactus in your dome, except more effective.
It's 2 rows of 3 cactuses, sitting flush with the ground. Below the sand are columns of glass. The ground immediately around the cacti has been replaced by glass block and the area below the glass block is mined out so that you can run around under the cactus, circling the glass columns... forcing baddies to die.
It works especially well with spiders because they can see you through walls and give furious chase.
With creepers though, you must first make open air eye contact with them before they'll chase you back to be killed.
Skellies and zombies are probably the same... requiring eye contact for a serious chase.
I had a similar setup in our Bridgeport World.
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