Valerie,
I’m glad to hear you’re enjoying your Garadget setup.
With each IFTTT applet you select which door you want to control. You can setup separate IFTTT accounts for yourself and your wife and that should allow you to control different doors.
I hadn’t had experience with Tasket so can’t tell for sure, but you can always control individual garage doors by using any service capable of calling a specially formed URL as shown in Garadget’s early IFTTT implementation relying on Maker Channel.