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I wouldn't advise it, the VO use bar codes on the application pages and is required for them to process your visa application. The only time you should use ink is when you are signing the forms. Fill out all pages on PC and print out all the bar codes it asks of ya. Cheers.
 
I wrote on some of my forms that I didn't have enough space to type in on the form. Shouldn't be a problem to do so. Some people don't use a computer at all. It's not so much a requirement as it is a preference