I guarantee you fewer than 50% of people who use a desktop computer at least once a week know how to multi-select and range-select using shift and ctrl on them, though. That's why you need the text—which many will, for reasons that are actually pretty good, ignore.

Or you could just use a better control.

It is standard but it is not used often. In fact, I can’t remember the last time I saw one used that want some ancient, intranet application built on Cold Fusion.

Many users don’t even know you can use a key shortcut to copy/paste.