schtasks - single task, multiple dates

Ok, riddle me this riddler!!!

Short story
I need a non-GUI method of creating a SINGLE task that runs on multiple dates/times, but the dates are non-standard (based on fiscal periods, so I would specify the dates).  This could be some type of xml, or a single line that with a bevy of parameters, or multiple lines, or whatever, but I dont want it to use the gui... all through the command line.

I know it can be done using the GUI... I've done it, but I need a way to automate this process.  I can create code that will create the script (or xml file or whatever) and I then save that script and run it when needed.

Long version
Lets say I have a program called "RunMe.exe" that accepts a parameter... so when I call it I will call it as "RunMe.exe 7" where 7 is the parameter.

My company does things in fiscal periods and I want Windows Scheduler to run this task at the start of every fiscal period (I have the fiscal lists, I dont need any method of calculating or pulling them automatically) at 10am

For this question.. without using the GUI, how can I create a schedule so that the task will run at 10am on May 1 2011, June 12, 2011, July 3 2011?

I already have the code to create tasks that run every monday and things like that, but I dont know how to do it for these fiscal periods.

I do NOT want a task for each fiscal period... so I dont want to look in the scheduler and see a bunch of tasks, such as:

"RunMe.exe 7" May 1
"RunMe.exe 7" June 12
"RunMe.exe 7" July 3

I want to open up the Windows Scheduler and see a single task, lets call it RunMe.  When I click on that task and go to the Schedule tab, I can see the list of dates(and times) that this task will run on.

I need something that looks like (which will run every day at 5:50am)
schtasks /create /s vServer1 /tn "RunMe 7" /tr "C:\SomeProgramDir\RunMe.exe 7" /sc weekly /d MON,TUE,WED,THU,FRI,SAT,SUN /st 05:50

I dont care if there are 3 lines.. the first line creates the initial task with date/time and the next two lines modify (or add or wahtever) the schedules dates to add the other two dates... or even an XML file or anything.

All I care is that when I am done running the single line, or 3 lines, or single line + xml or however its done, I have a single task with multiple different dates that I specify.

Is this possible at all or MUST it be done using the GUI?  I dont want to have to purchase any new schedulers or anything like that.  If it can NOT be done using the built-in Windows Scheduler, is there a free/safe/reliable windows scheduler replacement that I can use?  A different scheduler would only be my very last resort.

Thanks!