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Another editor has a function called Fill Block. When a block is selected, and the Fill Block function is called, then entering some text causes the entire block to be filled with that text. Does CudaText have something similar?

Not yet, but you can write a python plugin (we may merge it to CudaExt)

Oh, CudaExt already has it (limitation: works only for single line selection). in command palette:
"Fill selection by string".

Just what I was look for... works with column selection, too! Thanks to author.