Is there a reason you like to use a word processor instead of the text capsule? A word processor codes the text, just like HubPages text capsule codes the text. Some of the coding from your word processor is probably not allowed by HubPages and so it reformats it into something allowable.
Quite frankly I think the text capsule should have everything you need, including spell check, bold, italics, underline, paragraphs, etc. Tabbing that you might do in a word processor will be lost because that is not an html tag at all. Something like that isn't anything that could be changed by HubPages.
And at least when you use the HubPages text capsule, pretty much what you see is what you get. I would use it if I were you. If you want to save your work on your computer then you could copy from the capsule and put it into the word processor, format it the way you want, and save it.