I am running both Vector Linux Standard 6 RC4 and Vector Linux Light 6 beta 2 in a dual boot configuration. I have a different wireless card and a different Toshiba laptop than you do so it's not an apples-to-apples comparison, unfortunately.
Yes, ethernet interfaces are defined through aliases in /etc/modprobe.conf. On my Toshiba Satellite 1805-S204 I have:
alias eth0 e100
alias eth1 ath5k
eth1 is my PCMCIA wireless card and that is true both docked and undocked. My wireless card is an AirLink 101 (model AWLC4030) with an Atheros 5212 chipset so the hardware is different from what you have in every respect.
I don't know for certain if removing an invalid alias will fix your problem but it's certainly worth a try. No sense having it in there if you no longer had the card.