can I see the full list of your requirements?
well, inf items is not always good thing, of course, you can drop down or sell any count of selected item from inventory, but it has some negative sides too. for example, it's a good way to get your inventory full. in this case you can't just free up inventory to pick up one more plasma gun without disabling the cheat and dropping down existing items.
initially I did it, it's simple thing, but I found it almost useless for me personally. I spend my game time for shooting and not for trading and craft.
re: finding stealth mode - it may be implemented someday, but no promises. will take a look as time permits.
you can increase your stealth by 50% using just skill points.
UPD: attached the table. Unlimited inventory toggle is bound to numeric "/"