Is it possible to prevent banana plugs from conducting if/when they touch by wrapping the metal housing in shrink tube or electrical tape? Banana plugs that touched in a close terminal setup blew a few fuses in my amps. Luckily that seems to have been the only damage, but it could have been worse I'm sure. Why aren't banana plugs sold with a protective outer layer like all other cable have (RCA)? But most important is will that e-tape solution work so if they're in close proximity I can set my mind at ease?
If they can touch, don't use them or use something that can't reach from one post to another.
As I have written a hundred times, banana plugs aren't necessary. They were originally intended for lab/commercial use when making connections is frequent and people are on the clock. The problem started when manufacturers followed the stupid lead of wire peddlers who got people to believe the myth that ridiculously heavy wire was absolutely the only way to connect speakers that may only handle 30 Watts or they would be considered the same as lepers. This led to extremely crowded rear panels and when long, metal plugs are used, your problem becomes too common.
These won't short and they sound the same as the expensive ones. That means, don't worry about how they sound.