What is tactical?
I fully agree with Marion when he said, "What a can of worms." I won't bore you with why I think it's a can of worms. However, I do think that the answer to the question of what makes an ideal tactical folder will vary from person to person due to different needs and preferences. So, speaking only for myself, the following is what I would like to see in my version of the perfect fighting folder:
a. A hair under 4 inches.
b. Clip point.
c. False edge.
d. Recurved belly.
f. 30 degrees angle geometry (It's a fighter, not a scalpel.)
b. Stainless steel liner
c. Shaped to aid retention. (Perhaps THE most important thing. My favorite overall design is Bob Kasper's.)
3) Locking mechanism
a. Must be able to withstand a reasonable amount of sharp impacts.
b. Must be able to withstand a reasonable amount of weight stress.
c. Must not compromise the use of the three basic grips (saber, natural, reverse).
d. Should use a flathead screw so the tension can be adjusted with a dime.
d. Would be nice if it wasn't too sensitive to mud.
a. Ambidexterous opening. Oh wait, you're using the Spyderhole. Nevermind.
b. A big, strong clip for tip-up carry. In fact, feel free to standardize this for all of your knives.
c. It would be nice if it was balanced right at the pivot.
d. Capable of opening quietly.
I'm sure there's more, but I can't think of it right now.