That would do it. It's usually called 'attached devices' in my experience. Check it when things seem sluggish and you'll know.
Here's my suggestions, in order of paranoia. You should do at least the first 3
1) WPA2 if your clients support it, then use WPA.
2) Pick a non-obvious SSID. I use a nonsensical phrase (e.g. Leaping Burgers)
3) Turn off SSID Broadcasts.
4) get your MAC addresses and turn on MAC address filtering.
5) set up a passworded proxy server, configure all your computers to use it, and block all outgoing traffic not from the proxy server.
If you REALLY want to be a nerd (like me) I have a completely sanitary network where my wifi is, and I have to use ipsec to get to the REAL network, with my SAN and Internet access.
But I'm the computer equivalent to Uncle Jed in the middle of nowhere, with an electrical fence around his property, a moat, and an armed militia patrolling his homestead.