Install AutoHotkey

Take a few minutes to learn a little bit about AutoHotkey then download and install the free AutoHotkey utility (sorry, Windows only, but there are similar utilities for the Mac):

http://www.autohotkey.com/download/AutoHotkeyInstall.exe

Configure script to speed up split transaction entry

Save the following hotkey script to a folder on your computer: Split.ahk  The default hot key combination for this script is ctrl-space, but you can change it to whatever you want.  Note that the hotkeys cause the picklist to lose focus so the script first sends a down arrow to re-highlight the tag , then selects it with a right arrow (which is why you have to type enough characters so there is only one tag in the list).

Configure script to add local tax to a split transaction amount

Save the following hotkey script to a folder on your computer: Tax.ahk  The default hot key combination for this script is ctrl-t (for tax), but you can change it to whatever you want.  Also, you will need to change the tax multiplier from 1.0625 to whatever applies in your area.  Just right-click on the script and select "Edit Script" then modify the following line:  theResult *= 1.0625

Run the AutoHotkey scripts

Run each script (double-click) to add it to your system tray. Just put a shortcut to this file in your Startup folder to automatically run the script when you log in to Windows.

Example of using hot keys in Wesabe

Say you want to enter a Walmart receipt as a split transaction.  There are four items which you want to tag as Misc, the rest as Groceries. Here are the keystrokes:

1. Type in "mi" (shows your "Misc" tag in the list) 
2. Press ctrl-Space (selects "Misc" tag, backspaces, then adds a colon) 
3. Type the amounts for the 4 Misc items as follows: 1.62*3+7.44 then press ctrl-t (performs the math including your local tax) 
4. Type in "gr" (shows your "Groceries" tag in the list) 
5. Press ctrl-Space (selects "Groceries" tag, backspaces, then adds a colon and Wesabe calculates the remainder)