Sorry guys, I should not have mix up my questions.
For the Corporate DNS question, I am using RAP with Split-Tunnel. I have ACL for Corporate IP Destinations including the DNS server followed by the any any route src-nat ACL for all other traffic. I get no hits on the corporate DNS server when attempting to resolve names with the domain I have specified (which is the corporate DNS Suffix). I do have the Corporate DNS server (and only that server) being assigned to the client via DHCP server sitting on the VAP assigned VLAN.
For the DHCP server question, understood. It will not work on a flat network. It makes sense, I just wanted to confirm I wasnt missing something here.