There are several different projects (on the basis of Bitrix, Wordpress, Symfony, for example).
The Bitrix need to activate some settings that in others it is not necessary (for example short_tag).
Whether it is possible to make project on Bitrix was your php, wordpress and symfony your own?
And to or all at the same time could work, either with script you can quickly switch to the desired config (e.g. using a script you can quickly and without any dance to change the version of php, like in this case).
This is all possible or a pipe dream?