I've always loved Archers, but I was never very fond of rangers. I always wanted a gnomish or halfling Archer for the save bonuses, or a human Archer who could dual-class to mage or thief. So, I've created a new Archer kit for fighters, as well as an Archer kit for paladins and thieves.
The Archer kit is identical to the original ranger kit, with two exceptions: first, the ranged damage bonuses no longer slow down after level 18 (and now scale up to level 50 if your install removes the XP cap). Second, Archers can gain Grandmastery in slings and darts as well as bows and crossbows.
The classes still retain their unique differences. Archer rangers and thieves will still be able to use stealth, Archer paladins and rangers can still cast spells, and Archer thieves will still be able to set traps. However, Archer thieves will no longer be able to backstab (like regular Archers, they are not adept at close range combat) and will only gain 15 skill points per level instead of 25, in lieu of a regular Archer's armor restrictions (which would be redundant for a thief who can't wear metal armor before Use Any Item anyway).