File this one under annoyances. To enable Right Click "Run as different user" option without having to hold the shift key, Download the SysInternals Suite from Microsoft.
Open up a command prompt, then run shellrunas /reg command from the Sysinternals folder.
Now all you should have to do is right click on the file, and you should have the run as different user option.
Another alternative is to use the following built-in command, but I found this doesn't work as well.
C:\Windows\System32\runas.exe /profile /user:{DOMAIN}\{USER} C:\Program Files\Microsoft Office\Office14\INFOPATH.EXE /design
