Even if ebola does not cause sneezing. People with ebola can also get a cold or flu.
That's a good point. Can you imagine the microdroplets being sprayed from an Ebola-sufferer who has the flu? Worse, since Ebola has "flu like symptoms", they will be masked by somebody who has the actual flu, and this person will be spraying everybody in the office with their body fluids, and nobody will give much concern, thinking it's the 'ordinary flu'.
Now imagine a person who has the flu, Ebola, and HIV, coughing, sneezing, and engaging in risky behavior. A trifecta!!! Quarantine anybody?
The edge case, trumped by the corner case.
"The good news is you have survived ebola hemorrhagic fever. Now have a seat sir, there is some bad news."