Setting network priority

[zer0halo <zerohalo gmail com>]

Is there any way to give priority to a certain network? For example, I have several wireless networks that I connect to, but if a certain network is in range I always want to connect to that one even if others are present (and have a stronger signal). As it is now, network manager seems to select the one with the strongest signal (which is smart, but not always preferred). 

Similar, could there be a way to tell network manager to stay on the current network until the signal drops completely, even if other stronger-signaled networks come into range? That would avoid "network-hopping", which is undesirable in certain situations (ie, one network is secure and another is not).

-- 
"Impossible is nothing."