Today I had the problem that I had to alter my php.ini because the joomla pony gallery plugin needed extra memory when generating thumbnails and the strato memory size was too low for processing.
So I did some research and found out that Strato allows own php.ini files which can overwrite their values. Problem was only that I could not get my own php.ini to work with the website or backend, I got a lot of internal server failures. So I did some research again and here are the correct settings to use own customized .htaccess and php.ini:
create a .htaccess in your root dir :
Directoryindex index.php , index.htm, index.html
AddType application/x-httpd-php5 .php .php4 .php3 .php5
next create a php.ini in your root dir and in your administrator dir where you now do what you like and it actually will work:
register_globals = Off
safe_mode = Off
memory_limit = 16M
upload_max_filesize = 10M
max_execution_time = 30
max_input_time = 60
so have phun with this!!