FAQ
Yes, no, maybe. There are some commands available which completely rewrite the existing PHP files. I have no clue, if this will work for any PHP class. Try it. Fail. Revert it ;-) But don't tell me that it is not working. Move the foreign extension into the configured export directory. I'm pretty sure for commands which just adds complete new files you will not get any error, but please be careful while adding further controller action methods or getter/setters for foreign domain model.
See chapter Configuration. By default a new extension will be
exported to [TYPO3 Temp. Dir]/ext-kickstarter/*.
Sure, extension kickstarter will completely rewrite full PHP file, but in most cases it keeps existing code as it. It only adds new functionality and will never delete a method or modify existing methods. But yes, it may happen that some spaces or empty lines will be removed after rewriting a PHP file. Extension Kickstarter does not have any kind of configuration file where you can define what have to be overwritten or not like done in EXT:extension_builder. I prefer to backup your extension before you start modifying it with extension kickstarter.