This is the list from WoW wiki.

Reset Conditions

When using more than one condition "/" should be used between the functions.
<number> - The number of seconds since the last click
target - You changed target
combat - You entered or exited combat
alt - Alt was pressed (does not work 4.0)
shift - Shift was pressed (does not work 4.0)
ctrl - Ctrl was pressed (does not work 4.0)
It does not list focustarget as a possible reset condition.