You can make custom commands by learning Batch file programming and setting a .bat file in a directory defined by the path...
here is an example of a .bat file i named l.bat... That way to ran a command in the address bar I type something like "l ps" to start photoshop
-Jon
Here is the example file:
@ECHO off
cls
REM -------------Help stuff---------------
if '%1'=='help' goto HELP
if '%1'=='backup' goto BACKUP
REM -----------Commands------------
if '%1'=='edit' START c:\progra~1\wscite\SciTE.exe
if '%1'=='editme' START c:\progra~1\wscite\SciTE.exe c:\nojbat\l.bat
if '%1'=='ps' START c:\progra~1\adobe\adobep~1\photoshop.exe
if '%1'=='il' START c:\progra~1\adobe\adobei~1\adobei~1.lnk
if '%1'=='golive' START c:\progra~1\adobe\adobeg~1\golive.exe
if '%1'=='flash' START c:\progra~1\macrom~1\flashm~1\flash.exe
if '%1'=='cool' START c:\progra~1\coolpro2\coolpro2.exe
if '%1'=='word' START c:\progra~1\micros~2\office11\winword.exe
if '%1'=='aim' START c:\progra~1\aim\aim.exe
if '%1'=='ssh' START c:\progra~1\sshcom~1\sshsec~1\sshcli~1.exe
if '%1'=='mail' START c:\progra~1\MOZILL~2\THUNDE~1.exe
if '%1'=='ftp' START c:\progra~1\SMARTFTP\smartftp.exe
if '%1'=='d' START firefox
http://dictionary.reference.com/search?q=%2
if '%1'=='weather' START firefox
http://www.weather.com/weather/local/46260
if '%1'=='g' START firefox
http://www.google.com/search?q=%2+%3+%4+%5+%6+%7+%8+%9
if '%1'=='cal' START firefox
http://www.google.com/calendar/render?pli=1
goto END
:HELP
echo +----------C O M M A N D S-----------+
echo !------------------------------------!
echo !edit - SciTE !
echo !ps - Adobe Photoshop !
echo !il - Adobe Illistrator !
echo !golive - Adobe GoLive !
echo !flash - Flash MX Professional !
echo !cool - Cool Edit Professional !
echo ! !
echo !aim - AIM !
echo !ssh - Secure Shell SSH Client !
echo !ftp - SmartFTP Client !
echo !mail - Mozilla Thunderbird !
echo ! !
echo ! !
echo !g - Google (up to six words) !
echo !d - Dictionary (plus keyword) !
echo !cal - Google Calendar !
echo !------------------------------------!
echo !editme - Open l.bat in SciTE !
echo +------------------------------------+
pause
goto END
:END
exit