Question: Can we configure wireless router as an access point only?
Yes!! You can do that. This is useful if you need to create a wireless network and access Internet through an existing home Ethernet router.
The setup is much simple then configuring it as router. Just connect wireless router’s LAN port to home router’s LAN port with crossover cable. After that, proceed to configure home network IP, netmask on the wireless router (we just treat this wireless device as part of our home network). Finally configure SSID, wireless mode, encryption and other wireless settings and then it should work.
Ignore the WAN port of wireless router, you are not going to use it. Also you need to disable the DHCP and other WAN related features as well. Check out here on how to do it in details if you are still now too sure.