Coupon valid for a specific day of the week

[DamienDLSkinSolution]

Dear All,

As usual, a lot of reading & searching before posting, so I hope I didn't miss the obvious...

I am looking at having a coupon valid every Tuesday.
In the Coupon admin, you can set a specific date or a range but there is no option for recurrence.
I looked at the Add ons, no luck there neither.

I could set up my coupon for next Tuesday and copy it 52 times, changing the date each time to the following Tuesday, so it would work until next year... but I hope there is a smarter way.
Update: Actually, I couldn't... I just noticed I cannot duplicate and use the same coupon code...
How could I do let's say a 50% off on the same selected items every Tuesday?

Any idea?

D

(using 1.3.9.d - i know, I know... I need to upgrade)