• Start a MP server running the a Warlords Scenario/MPMission.
• Change mission start params to 5000 starting credits.
• When mission commences, access inventory by pressing 'I' key.
• Access the Warlords menu by holding down the inventory key.
• You now have access to the arsenal - where you can create/select/load loadouts.
• You also have access to your inventory and the ground all at the same time where you can drag+drop items onto the ground from your inventory.
• Drop all your player items/weapons onto the ground.
• Select a pre-saved loadout or create a new one.
• Drop all items on the ground.
• Repeat ad infinitum - you can continue dumping vast amounts of items onto the ground, effectively infinite ammunition/equipment.

This can be easily fixed by modifying the following game function file:

a3\functions_f_warlords\Warlords\fn_WLOpenArsenal.sqf

From this:

/*
WARLORDS-SPECIFIC FUNCTION

Author: Josef Zemánek

Description: Opens Arsenal interface.
*/

_funds = player getVariable "BIS_WL_funds";

"close" call BIS_fnc_WLPurchaseMenu;

_null = ["Open", TRUE] spawn BIS_fnc_arsenal;

player setVariable ["BIS_WL_funds", (player getVariable "BIS_WL_funds") - BIS_WL_arsenalCost, TRUE];

To this:

/*
WARLORDS-SPECIFIC FUNCTION

Author: Josef Zemánek

Description: Opens Arsenal interface.
*/

_funds = player getVariable "BIS_WL_funds";

"close" call BIS_fnc_WLPurchaseMenu;

_null = ["Open", TRUE] spawn BIS_fnc_arsenal;

// Check if Inventory Dialog is open and close it after Arsenal is triggered.
// This prevents players from equipping loadouts within the Arsenal to dump from inventory onto the ground, a method which should be considered a glitch.
// Within the Arsenal the inventory dialog is disabled, after Arsenal is closed the inventory returns to its normal function.
if (!isNull findDisplay 602)then {closeDialog 602};

player setVariable ["BIS_WL_funds", (player getVariable "BIS_WL_funds") - BIS_WL_arsenalCost, TRUE];

By calling

if (!isNull findDisplay 602)then {closeDialog 602};

After the Arsenal is opened you disable the ability to access the inventory from within the Arsenal by closing the inventory dialog this way.
When the Arsenal is closed inventory function returns to normal.
This will not affect anyone's keymap's and thus cannot be circumvented by remapping inventory keys.

I made a video demonstrating the glitch and the fix in action:
https://youtu.be/Dl7E1y3FmpU