A 1 day plan for $5 would be a nice option. Spending $20 for a one day trip to the US is kind of high. Koodo even offers a 3 day plan so I don't see why you can't. I'm sure that i'm not the only one wishing this.
Koodo will soon be offering a similar $5 a day roaming feature. But i beleive pre-paid and post paid roaming add ons are different. I think all of the daily roaming features (Rogers, Fido, ect) are on post paid.
I STILL Think Prepaid can have the BEST parts of the POSTPAID EXPERIENCE, Sans Credit Checks, Grace Periods, Phones, Call Centers, Physical Brick and Mortars, BUT ROAMING Globally is CERTAINLY possible, & the Flexibility is also Possible. Just look at the US Roam Add-On, It's Possible, NOT Impossible