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not 100% sure about any options addressing the issue directly, but you can use edit/replace in HTML view to replace any <p> </p> with <br>'s
Frontpage "aint bad" at making CSS either. Maybe you might want to toy around with using CSS for line spacing etc, so you can define what any tag you use "should" look like.
Edit/replace is under the Edit menu button (funnily enough) :)
To make CSS in FP, if you dont know...just make a new page and save the extension as .css. Then go to Format > Style on that page and CSS is created.
I'm not sure what you mean by "double the code" though...do you mean you are left with using both <p> and <br> tags combined?