HTAccess Rewrite Combo Meal (No Protocol, WWW, Add Trailing Slash, Etc)

Normally I have been able to copy paste the htaccess I needed but when I needed to do multiple modifications to a URL I can't seem to combine them or I end up with about 20 rules of which half are not necessary.

This will be a template for a large number of websites I will be doing so I'm looking to get it perfect. All of the websites are CMS style(single entry point index.php - forgot what its called)

This is the URL structure I'm looking for

1. Base URL: example.com/ (Remove HTTP, WWW, index.php/html(if entered), Add Forward Slash)
2. Top Level File: example.com/file (No Extensions, No Trailing Slash)
3. Directory/File: example.com/directory/file
4. Query String: example.com/directory/file?parameter=value

Currently, I have the following which is what I'm looking to modify. As I'm not well versed with htaccess please point out any self defeating and redundant logic in what I do have. This allows me to access the above file structures so that part works at least.

<IfModule mod_rewrite.c>
    RewriteEngine on
    # Do not rewrite AJAX request file
    RewriteRule ^(ajax.php) - [L]
    
    # Do not rewrite specific extensions
    RewriteCond %{REQUEST_URI} !\.(css|gif|ico|jpg|js|png|swf|txt)$
    
    # Do not rewrite existing files
    RewriteCond %{REQUEST_FILENAME} !-f

    # Do not rewrite existing directories.
    RewriteCond %{REQUEST_FILENAME} !-d
	
    # Pray it works
    RewriteRule ^(.*)$ index.php?url=$1 [PT,L,QSA]
 </IfModule>

Code (markup):

Many thanks in advance for schooling me