Add these code into "Pre-deployment Command Line" section:
@SET STSADM="c:\program files\common files\microsoft shared\web server extensions\14\bin\stsadm"
net stop SPAdminV4
%STSADM% -o deactivatefeature -name EF_SimpleReminder -url http://hvsp2010 -force
%STSADM% -o execadmsvcjobs
net start SPAdminV4
net stop SPTimerV4
net start SPTimerV4
Re-create job in "Feature activated" event:
Now, we can deploy the job through Visual Studio 2010, then attach to the process "OWSTIMER.EXE" and begin to test it.