haha
actually you know the installer never turns off any thing you have enabled
also its kept right before the install, so that the install happens correctly, so you may note those things being displayed there and afterwards, post installation, whatever server config changes you do, you may run the php.ini and check if those are still enabled or not
moreover, if any important module is removed or unloaded, it may effect blesta functionality, in some or the other way - from support ticket to license to any things
moreover, we never disable those which are ever asked to be enabled during any install
and one thing which is never advisable is you may always run a test install to check the things, but never run it completely, just to the first screen, may be this will resolve your needs