I don't know about putting them sideways but it would be cool to have a mirror to turn them sideways. I can imagine they'd need to set a limit on how long the beam would be if they did this though because that could cause a lot of lag otherwise.
"Strong Pokémon. Weak Pokémon. That is only the selfish perception of people. Truly skilled Trainers should try to win with the Pokémon they love best."
Who else agrees that Mojang/Microsoft should add beacons that automatically glow and can be put side ways, upside down ect.
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Also this forum is not for suggestions, next time I recommend posting here -> http://www.reddit.com/r/MinecraftSuggestions (Mojang actually looks here for ideas).