Below is the way how we can add the section frames by preserving the content element ID. This way works on TYPO3 6.x.

1. In TS template

### FRAMES ###
tt_content.stdWrap.innerWrap.cObject {
100 < tt_content.stdWrap.innerWrap.cObject.default
100.20.10.value = boxclass
}

2. In page TS Config

TCEFORM.tt_content.section_frame {
addItems.100 = My custom box
}