Managing/Updating headers in Apache Server - apache

Question

We are using Apache as our Web server for our CRM application (Siebel) . We continuosly deploy new JS and CSS files on the CRM application in 15 days Currently we have the following setting.
FileETag None
ExpiresActive On
<IfModule mod_expires.c>
ExpiresByType text/css "access plus 5 days"
ExpiresByType text/javascript "access plus 5 days"
ExpiresByType image/gif "access plus 5 days"
ExpiresByType image/jpg "access plus 5 days"
ExpiresByType image/png "access plus 5 days"
ExpiresByType application/x-shockwave-flash "access plus 5 days"
ExpiresByType application/x-javascript "access plus 5 days"
AddType image/x-icon .ico
ExpiresByType image/x-icon "access plus 5 days"
</IfModule>
In this case if we have a Hotfix release we have to ask the end users to clear their cache so that the new files can be reflected from their side else they have to wait till the objects expire and are auto refreshed.
If we set it to a lower value than the requests to the web server increase and the load increases on web server.
I would like to know is there any mechanism.
1) To auto update the new files on end user machine automatically when a new file is placed .
2) To set expiration of folder level rather than a file level.
Thanks

Answer 1

In response to point 1)
I'd suggest using versioning at the URL level.
I.E mysite.com/lib/js.js?v=1, mysite.com/lib/style.css?v=1 (etc.. etc..)
When you roll out a new version, update this to v=x (and so on).
There is no way of forcing a client to flush it's cache, mainly due to all the browsers being implemented different (they'd all have to implement this), and it would no doubt be some risk of security.
As for point 2) maybe this question might help:
ServerOverflow - Apache: ExpiresByType per directory?