RE: Active/ Inactive Vendor Search List
Two things might help you with this.
There is an add-on product that's free from EthoTech called SmartSort. It lets you filter the lookups on an organization-level (or user, user class, etc).
This will override the default functionality of the lookups and not require the users to always change it.
If you'd want to do a Google- or Bing-style search in ALL of the lookups in GP, Rockton Software makes a product called SmartFill. You can create custom searches for all of the lookup fields and also search on more than just ID or description -- any field can be a search field.
They are both really awesome.
I hope this helps.
Joe