When clicking my trackpad physically, I want the double click speed to be as fast as possible. When using the tap-to-click feature, though, I want it to be a tiny bit slower. Is there any way to set this, either natively or with third party apps?
Set different double click times for physical click and trackpad double-tap
clicktrackpad
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Yep!
You double-tap and lift off to select the word. Then double-tap the selected word and start dragging immediately keeping your finger down. It's actually kind of tricky to get to work without dragging the word but once you get it a couple of times it gets easier.
Here's an explanation on how to do it also from macworld.com, same as above:
To select text (and this works in nearly any program that involves text) on a word-by-word basis, do a double-click-and-hold before you start dragging, instead of a single click. As you move the mouse along now, you’ll see that entire words are added to your selection as soon as the cursor touches their first character. So if you’ve got a fair bit of text to select, but still need precision, this is a pretty quick way to get it done.
Here are my trackpad settings
As far as I know, there is no way to do this without external tools.
Usb Overdrive lets you do this http://www.usboverdrive.com/ and is what I use.
Steer mouse also has this setting. http://plentycom.jp/en/steermouse/
Mouse Curves http://triq.net/articles/mouse-acceleration-preference-pane-mac-os-x Has the advantage of being free, but Apple removing the acceleration API in 10.6 may have ramifications on its utility.
Best Answer
You can rule out SteerMouse, I just connected a second mouse and there is only one setting for double-click delay shown. Based on that I'm doubtful of USB Overdrive's claim: "The USB Overdrive can easily handle several USB devices at once and can assign different settings to each one." - but it's probably worth a look!
I think ControllerMate could do it if the developer felt like it - it's a way more configurable approach and is flexible enough to build complex control schemes for HOTAS game controllers. You should register your interest in being able to control the Magic Trackpad with a quick email. I don't know for sure that ControllerMate can't do what you want, it all depends on whether its building block approach sees a "Source" for each mouse-like device or whether it just uses the kernel's mouse driver output and sees an aggregate of control input for the two devices. There is a time-limited trial available.