Ok, and could you explain the actual issue a bit more? From what I understood you can currently connect to your wifi hot spot.
Disabling roaming is not really a setting per device (there is only a signal sensitivity threshold, but that usually cannot be changed with many wireless chipsets or they ignore it) but more a setting for the applet that chooses between available known or open networks. Actually roaming means switching to another access point for the same SSID, which is common for enterprise wireless installations but also common if wireless expanders / repeaters are used.
So does the SSID you connect to consist of several different access points, or is it only one physical AP, do you happen to know ?
You could also look at /etc/wpa_supplicant.conf and /etc/sysconfig/network-scripts/wireless.d for the known networks, but if you decide to post those please make sure to remove the keys/passwords
You could try to take a look at drakroam, if there are any advanced settings there.
Overall I'd recommend to switch to networkmanager, I've described how to switch from Mageia's default net_applet to that here:
viewtopic.php?f=25&t=5782