I haven't seen anyone mention this yet. dClicker is a simple utility, developed with the Autohotkey scripting package, which lets your left-mouse button rapidly double-click when held down while playing Diablo. As you've probably noticed, D1 does not auto-click when the mouse button is held down. Unless you want to shave a few years off your mouse's life-expectancy, using dClicker or a similar utility is essential.

The tool can be downloaded from the Fresh Meat fansite:
https://freshmeat-blog.de.tl/Downloads.htm

The archive is in .RAR format, so you may also need to install 7-Zip File Manager (7-zip.org) or a similar archive manager tool to open it. Open the archive file, and look in the Diablo Clicker V3.1 folder within the archive. Copy dClicker_v3.1.exe to your game folder. Run that file before starting the game. When you're done playing, you'll need to right-click on the dClicker icon on your task bar and select Exit.

For those who are hesitant to install an unknown application (as you should be), the Autohotkey script file is included. You can install Autohotkey (autohotkey.com) and run the uncompiled script file directly so you can see exactly what it's doing.

I can't get it to work in-game. The contents of the 3.1 folder are in my diablo directory and I launched the program prior to launching diablo. Are you all able to use this on the single player/dxwrapper build of diablo?

Edit: Nm. I got it working. You just need to put it in the diablo/dx directory if you're using the dx wrapper

My virus scanner didn't like the executable for v3.1 (dunno if that is a false positive or not), but I found that following the instructions for the v2.0 version works fine.

Alternative solution: Assign one of your side/thumb mouse buttons to rapidfire doubleclick. Then you'll still have your standard single-click LMB as well. This is easily achieved via X-Mouse Button Control. Garbage Logitech software can't do it (at least my ~year-old build can't), don't know about Razer, but neither is necessary. The X-Mouse Button Control profile can be set to only activate within Diablo.

Another control tip: you can reassign all keyboard keys using an autohotkey script, no reboot to update keymap required.

Example:

"; Diablo - Keyboard Remap

IF NOT A_IsAdmin
{
Run *RunAs "%A_ScriptFullPath%"
ExitApp
}

#SingleInstance Force
#IfWinActive DIABLO

; x triggers tab
x::tab
tab::v
v::i
z::q
n::s
q::f5
w::f6
e::f7
r::f8
t::o"

(Map on x, inventory on v, The Hell's weapon swap on tab, F5-8 on qwer, town portal on o...)

Make sure that what follows #IfWinActive matches the application window's name (which can be fullscreened). Default hotkeys for nearly all games are asinine. They're alpha-intuitive, but not ergonomically practical and not the way people choose to play when they are made fully assignable. For example, who wants to reach over from the 1234/qwer/wasd region to 'i' in order to open their inventory? I'd rather just memorize a key which I can always use for inventory: v. My controls are the same for just about any RPG.

Unfortunately, the developer of The Hell's newly added hotkeys follow the moronic alpha-intuitive approach. I'll be remapping all those spells as I acquire them. :/

Make sure that what follows #IfWinActive matches the application window's name (which can be fullscreened). Default hotkeys for nearly all games are asinine. They're alpha-intuitive, but not ergonomically practical and not the way people choose to play when they are made fully assignable. For example, who wants to reach over from the 1234/qwer/wasd region to 'i' in order to open their inventory? I'd rather just memorize a key which I can always use for inventory: v. My controls are the same for just about any RPG. Autoclicker