[TYPO3-english] Add fields to plugin

[Christian Lerrahn (Cerebrum)]

Hi,
is there an easy way of adding fields to the flexform of a plugin? I'd
like to add several flags to the tt_news plugin. I've had a look at
t3lib_extMgm.addPiFlexFormValue() but it seems I can only override with
that not append.

Is there also a way of appending more fields? Basically just like I can
append fields in the TCA for a record type.

Cheers,
Christian