I use namecheap as well and have one complaint. They don't allow you to specify the order of your nameservers! Regardless of the order you input your name servers the primary, secondary, tertiary nameservers will be assigned randomly with no way to specify the order. I sent a support request to namecheap and got the following response. Grrrr

Hello,

It does not matter which order they are listed, because when the nameservers are queried, they are queried simultaneously, and the first one to answer is assigned by the Registry to that particular query as "primary" at that point in time.

What this means is that regardless of how they are listed, the order of the listing does not determine which nameserver is queried first.

The order that the nameserves appear in the Registry is not up to the Registrar, and cannot be changed by the Registrar.