TYPO3 Core

Yes, of course php.ini sould read
something like this:

upload_max_filesize=24M
max_execution_time=240

BUT:
The key issue is, that this doesnt matter
for this bug:
php.ini is in root directory of typo3
but install tool does not look there
only the installed typo3 later on will
see this php.ini.

So the check button of install-tool should take the
typo3-root php.ini to check?
Copy or link the php.ini from root dir
to Install.php dir and the check will be fine.

I find this very important:
Install tool for the new typo3 7 should
go as soft and fluent as possible in my opinion.

php.ini in the rootdir?

TYPO3 does not read any php.ini file at all... that's the job of PHP itself.
With PHP you can only ask the runtime what the current configuration is, nothing more.

If your PHP config is not applied, this is not a problem of TYPO3, but of your PHP/server setup.
I'm sorry, but there's nothing we can do about it.