# \twosides in KOMA - Why is my titlepage not centered

I'm using scrbook with the twosidesoption, and BCOR=10mm. The title page, being an odd page, has a large margin on the right, and a small margin on the left.

I'm currently using the following to make the title page centered:

\KOMAoptions{twoside = false}
\maketitle
\KOMAoptions{twoside = true}

However, I'm getting warnings that I should not do change the typearea.

Is the above workaround unhealthy for getting the right input dimensions?

More importantly: When should one use a (one-sided) cover page, and when should one use a (two-sided) title page?

This question is related to Centered title page in twoside report and Make titlepage one-sided (centered) while all other pages are two-sided , but is rather interested in the technical and layout details.

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The question "When should you use it?" admits of no objective answer. When you think it looks better! Obviously only if you have a centered title page. Then the decision whether to center on the paper or the text-block seems to vary from publisher to publisher: a glance at a few books on my shelf shows both. –  Paul Stanley Apr 16 '13 at 17:38