*** Version 1.6.1 is temporarily unavailable while I work on a new version. In the interim, you can still download version 1.4. ***
This addon accelerates key bindings so that they are activated by key press rather than key release. This allows you to activate your abilities faster than you could otherwise. This can really make a difference for situations where you need to react quickly, like when casting heals, when dispelling, when interrupting spells, or in PvP. In these situations, the addon can have an effect similar to reducing your network latency by 100ms. Of course, the exact impact depends entirely upon how much time you personally spend between key press and release.
"Dude, this addon is going to increase my DPS by so much!" No, it's not. DPS rotations (or even priority systems) are not to any great extent affected by latency. Because they're predictable, good players can anticipate what's coming next and compensate for latency. In fact, if you're a good player who is already compensating for the press-to-release latency, you may actually find that your DPS goes down when you first use this addon until you learn to readjust to the reduced latency. Find a target dummy and practice your rotation until you're comfortable with the changed timing.
There is an in-game configuration GUI accessible through the usual Options->Interface->Addons menu. From this panel, you can add or remove keys and mouse buttons to be accelerated. You can also globally enable or disable all key acceleration.
The GUI provides exceptionally fast entry--you can enter your whole keyboard in seconds and all your mouse buttons in a few more seconds. The easiest way to understand this GUI is to start by hitting the "Clear All" button and then adding and removing some keys. In order to add just one key or mouse button, hover over the "+" button and type the key or press the mouse button (including whatever modifiers you desire). In order to remove that key, hover over the "-" button and type that same key with its modifiers. In order to enter all 8 of a key's modified and unmodified combinations with just one key press, hover over the "+ (Modifiers: All)" button and type the key.
If you want to do mass entry of modified and unmodified keys and mouse buttons, hit the "Clear All" button. Then hover over the "+ (Modifiers: All)" button and face-roll your way across keyboard and mouse buttons. You're done.
The default configuration accelerates all the modified and unmodified keys on a standard 104-key US keyboard (except PRINTSCREEN) plus mouse buttons 3-5. If you'd like to get back to this configuration at any time, simply hit the "Reset To Defaults" button.
SnowfallKeyPress accelerates key bindings of mouse buttons, but it doesn't accelerate mouse button clicks that interact directly with frames without any associated key binding. This means that although SnowfallKeyPress is compatible with click-casting addons like Clique and Vuhdo, it won't accelerate their mouse clicks. Vuhdo already provides its own mouse click acceleration, though, and perhaps Clique will at some point, as well. Until then, you can add support yourself by navigating to Interface\Addons\Clique, editing Clique.lua and CliqueOptions.lua, searching for instances of "AnyUp", and replacing them with "AnyDown".
Mouse scroll-wheel bindings do not need any acceleration, so don't be concerned that SnowfallKeyPress offers no way to accelerate them. Each "tick" of the mouse scroll wheel is, in effect, already a simultaneous press and release.
Added button press animations (enable or disable through the configuration panel).
Made some infrastructure changes that should be invisible to the user, but which should improve compatibility with addons written in the future that may have more complex behaviors than we generally see in addons today.
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