But they're now customizable. Only took a few minutes with IDA to crack this. Better late than never.
For the SFC_Editor
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SFC2OP v2.563
StarFleetOP.txt
Tab Year
CDA68: 1i // Vessel Library's "Date Introduced" (Shiplist YFA is added to this value) // 2263
47BFE4: 4i // Final inclusive year of Era, in terms of YFA, for Skirmish Mode (Early, Mid, Late, Advanced) // 0, 7, 35, 100
8689F: 1b // YFA Medium-speed Missiles (button highlighter) // 4
86B4F: 1b // YFA Medium-speed Missiles (button click) // 4
DB0FB: 1b // YFA Medium-speed Missiles (verifier) // 4
868B7: 1b // YFA Fast-speed Missiles (button highlighter) // 17
86B63: 1b // YFA Fast-speed Missiles (button click) // 17
DB100: 1b // YFA Fast-speed Missiles (verifier) // 17