WiFi Booster is a tweak for the Settings app that enhances the Wi-Fi networks list to display all networks in range by removing the signal level limit. This allows you to connect to as many networks as a WiFi scanning app would see, e.g. WiFiFoFum, directly in the Settings app. Sometimes the number of networks available is increased by over 100%! The network list item has also been enhanced to show the BSSID (AP MAC address) and RSSI (signal level) for each network.
Available to buy in Cydia for $1.99.