Its just the way that the sim was written Mike...can't change the code but we can work around it when we have multiple options:
Category=
1 - aircraft fighter
2 - aircraft level bomber (B-24, He-111)
3 - aircraft dive bomber (Stuka, Dauntless, Val)
4 - aircraft torpedo bomber (Avenger, TBF)
5 - aircraft tactical bomber (A-20, Ju-88)
6 - aircraft strike (Fw-190F2, A-4; 2-engine nightfighters?)
7 - aircraft civil
8 - aircraft recon (Storch)
9 - aircraft transport (C-47)
10 - aircraft fighter-bomber (any fighter equipped with bombs) or Dive Bombers
As a general rule, it seems that in WW2 not many tactical bombers on either side made use of HVAR weaps in strikes, but Allied torpedo bombers did quite a bit in the PTO after 1943. This may have been a factor in the programmers' minds. But cat6 and cat10 will also allow the use of missiles. I set my TCat to cat10 to allow the sim to recognize it as a fighter also. This gives the TCat AI the ability to perform as fighters when needed, like intercepts, sweeps, escorts and self-defense dogfighting after a bombing or torpedo strike.