CAS Array - Exchange Internal / External CAS URL values?

Hopefully a quick solution for someone.  We are planning the following:

• 2x CAS/HUB combined servers in a CAS array
• 2x Mailbox servers in DAG
• All running Exchange 2010 SP2

The following namespaces are planned:

• Internal and External domains have the same domain name (lets use domain.com)
• The CAS array is outlook.domain.com
• OWA, ECP, etc will be on webmail.domain.com
• Internal and external clients will pass through a hardware load balancer (Netscaler)

Now the questions:

1. By default, the external domain is set to webmail.domain.com for all services in 2010 when you install them which is OK
2. The internal domain picks up the individual CAS server names and not the CAS array
3. Should the internal domain URLs be the load balancer CAS address - ie outlook.domain.com or should they be webmail.domain.com or should they be left at the default of single server names?

I believe the following is required:

1. I believe the CAS array does not require an SSL certificate because Outlook clients do not connect over 443 so we are not planning on purchasingoutlook.domain.com on the SSL cert
2. Therefore due to clients connecting internally via the load balancer, all the internal URLs should be set towebmail.domain.com to match the external addresses?
3. Or should only the OWA and ECP values be webmail.domain.com and the rest of the URLs set toautodiscover.domain.com?
4. I am not 100% sure on the above, however, so maybe it should be the CAS array, but then internal clients would get a certificate error because outlook.domain.com is not on the cert for OWA

As far as I understand the CAS array value just sets the rpcclientaccess value for mailbox databases and no services apart from Outlook should use it?  I read that in an article about common misconceptions - ie that CAS arrays are for Outlook connections only and not used for load balancing?