More Than 93 Weapons Animations?

I don't think there should be any problem with modifying enemy specials to have weapon attack animations, but I haven't tested doing so.
Relocating the weapon animation data shouldn't be too difficult. For a theoretical 256 weapons you'd only need to find 2048 free bytes.
You could also just relocate the enemy specials, which would provide enough space for 128 weapons.
The following is the code that would need to be changed:

Code:

C1/9DA8:    BF E8 E6 EC LDA $ECE6E8,X    (Enemy special graphics and sound)
C1/9DAC:    99 6B 62    STA $626B,Y
C1/9DAF:    E8          INX
C1/9DB0:    C8          INY
C1/9DB1:    C0 08 00    CPY #$0008
C1/9DB4:    D0 F2       BNE $9DA8
C1/9DB6:    80 0E       BRA $9DC6
C1/9DB8:    BF 00 E4 EC LDA $ECE400,X    (Weapon graphics and sound)
C1/9DBC:    99 6B 62    STA $626B,Y
C1/9DBF:    E8          INX
C1/9DC0:    C8          INY
C1/9DC1:    C0 08 00    CPY #$0008
C1/9DC4:    D0 F2       BNE $9DB8