Confirmed affected:

Game

• DOL SHA1

ShdTH-Reloaded-v1.0-4-by-3

• 4256c885c63d60acbac0f558ee0b821b58204902

ShdTH-Reloaded-v1.0-Widescreen

• 8c7c6a4b7df5af53f0f702cbf3a84fa58fac1bee

ShdTH-Reloaded-v1.1-4-by-3

• 7208c12a7c34acb583232a4be2d6315d3f13d1a4

ShdTH-Reloaded-v1.1-Widescreen

• 08e43f571acc6db4d699c33e499b724a2602fce2

Confirmed unaffected:

• 2P Shadow (all versions)
• ShadowSX (all versions)
• Reloaded v1.2 (all variants)
• Original game
• 2P-Reloaded-v1.0a
• 2P-Reloaded-v1.0b

• Perform SHA1 check on main.dol on initial load, prompt/warn if matching hash of the above 4 ROMs.
• Update warning text to not include 2P-Reloaded, as it turns out those are unaffected.