No I won't enable WEP permanently.
I just do it now when I want network on my Amigas.
Not that often I need network on Amiga but would be nice to get Mac-filtering to work.
I know it's possible but I'm not that worried about someone hacking my network by spoofing MAC-addresses.
I guess I could get a card that supports WPA but I have noticed a speed difference when using WPA also.
Anyway it's not a big problem...guess I can live with enabling WEP sometimes.