Alright, just started a playthrough of GMDX 8.0. Whether I'm just doing something wrong or the mod changed something I don't know, but here's some things I noticed:
-Hitting corpses with your melee weapon seems to produce a hit sound depending on the surface beneath the corpse rather than the organic 'squish' sound when you normally hit someone with a melee weapon
-Weapons can be holstered by double-tapping the use button, but can only be unholstered by pressing the respective number key on your toolbelt? Considering my last weapon I just used is highlighted on the toolbelt, I'd expect that pressing the fire or use key would unholster that weapon, but it doesn't, and having to press the respective number key again is a bit unwieldy
-Grenades as secondary weapon are equipped and have to be thrown afterwards, rather than being immediately thrown once you press the Secondary Weapon key, unlike thrown and melee weapons, which kind of defeats the purpose of secondary weapons
-In the Liberty Island level, I picked up and immediately dropped one of the many UNATCO troop corpse, which alerted and prompted a nearby patrolling NSF soldier (who should have already seen that corpse and ignored it long before I entered the scene) to check out the corpse and the surrounding area. Does the NSF AI on Liberty Island ignore UNATCO corpses as long as you don't move them?
-Are there no Build Engine-style bloody footprints when you step in a puddle of blood?
-Are fire extinguisher gas and pepper spray supposed to trigger tripwires?
-You can't use your secondary weapon when holding items in your hand other than weapons, such as flares, extinguishers, and so on.
-Wouldn't it be more useful to have some kind of indicator when you're aiming at someone's head/back and are ready for a backstab? Sort of like how Spy in TF2 raises his knife when he is in backstabbing range. Stealth games operate on a very thin margin of error, and alerting the enemy just because you missed a vague hitboxes by a few pixels isn't really that fun
-I remember (in another mod?) being able to click the use button on a locked door which would automatically pull out my keyring for the sake of convenience. Is this feature not present in GMDX? (the same could also be done for locked doors and lockpicks, security and multitools, and so on)
-When you don't have anything equipped, pressing the secondary weapon key in order to attack with your melee weapon instead equips your melee weapon first, and doesn't let you attack with the secondary weapon button once you have the weapon assigned to the secondary weapon button equipped, which is quite confusing
-Minor suggestion: displaying the Hacking level required in order to hack a device just by aiming at it (like displaying lock/security strength) would be useful
-Minor gripe concerning basketball physics: IRL basketballs keep rolling around after a bit after they stop bouncing, whereas in GMDX they come to a complete standstill