so, i finally got tired of not being able
to set the mac address on wi devices... so i fixed it. 
it's just a few lines, but now e.g. wiconfig -m  works again.    
here's a diff from the -current sources of /sys/dev/ic/wi.c : 

15:29:35 vinyalonde $ diff wi.c wi.c.new
2307a2308,2312
>         case WI_RID_MAC_NODE:
>               memcpy(ic->ic_myaddr, wreq.wi_val, ETHER_ADDR_LEN);
>               IEEE80211_ADDR_COPY(LLADDR(ifp->if_sadl),ic->ic_myaddr);
>               wi_write_rid(sc, WI_RID_MAC_NODE, ic->ic_myaddr,
IEEE80211_ADDR_LEN);
>               break;

a full copy of my updated wi.c is here: 

http://www.vaxpower.org/~isildur/wi.c.new
http://www.vaxpower.org/~isildur/wi.c.new.MD5


happy hacking,
isildur