Gorgon Zee
Hero
Hmmm. I could dig out my books later and check, but the following link indicates it was a standard rule:Well, that was definitely not 'stock' AD&D (either edition). Weapon Speed was really a very obtuse and poorly explained rule, as-written, and frankly added very little to the game (in either 1e or 2e, it worked a bit differently in each one). While it might IN THEORY favor faster weapons, it didn't actually come into play enough to matter much. I think the way you describe using it, or variations on that, were QUITE common though! Probably a lot more playable than the original too (1e in particular has a pretty crap combat system IMHO, mostly in terms of how it is explained more than how it plays though).

PHB Ch9 Initiative
The initiative roll determines who acts first in any given combat round. Initiative is not set, but changes from round to round (combat being an uncertain thing, at best). A character never knows for certain if he will get to act before another. Initiative is normally determined with a single...
I'll copy the relevant text in:
Standard Initiative Procedure
To determine the initiative order for a round of combat, roll 1d10 for each side in the battle. Normally, this means the DM rolls for the monsters (or NPCs), while one of the players rolls for the PC party. Low roll wins initiative. If more than two sides are involved in combat, the remaining sides act in ascending order of initiative.Weapon Speed and Initiative (Optional Rule)
Weapon speed factors slow the speed of a character's attack. The higher the weapon speed factor, the heavier, clumsier, or more limited the weapon is. For the most part, weapon speed factors apply to all creatures using manufactured weapons. The speed factor of a weapon is added to the initiative roll of the character to get his modified initiative roll.I think you are asserting at least one of:
- This (fan) site is not correct and the AD&D books have different rules --- this may be the case; I only have the version of AD&D with d6 initiative.
- This description is "very obtuse and poorly explained"
As far as I can read it, the way we ran it is RAW, choosing an optional rule to use; it was a dead simple rule to understand and use; in practice we found it fun, although if you tried it and found it unfun, please let us know what made it feel bad/useless/whatever for you.