Why cant you drag and double click? Its normal clicking methods allowed on all servers Ive seen, exept cubecraft..? Its not cheating and it only effects blockplacing since its 1.9+, I cant see a reason not to have it.
Minecraft PC IP: play.cubecraft.net
I think this closed thread is a perfect answer to your question! 
https://www.cubecraft.net/threads/why-is-drag-clicking-disallowed.300836/
https://www.cubecraft.net/threads/why-is-drag-clicking-disallowed.300836/
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