if it's a Linksys router it should have the ability to disable DHCP. You COULD leave it on, I suppose, but it could conflict with the other router's DHCP, even if you manually assign static IPs to all computers.
As for settings, it's hard to say. Our old modem wouldn't work unless I manually entered the IP address and what not assigned to us from our ISP. However, our new one is totally dynamic and aquires it automatically.
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Primary- i7 920 | 6GB RAM | 9800GT | 160+160+500GB
Secondary- Athlon X2 4200 | 2GB RAM | 7600GT | 80+250GB
Netbook - Atom N280 | 2GB RAM | GMA945| 160GB
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