This arrangement has one unfortunate downfall: the time limit for children in Småland is 45 minutes. And Ikea is a huge place. The policy used to be 90 minutes, but it has recently changed. Unless you know exactly what you want, it's not enough time. I'd recommend either taking your children with you in the store and going to Småland once they are bored, or checking them in immediately and see how far you get. We hid our cart near the checkout line; retrieved the children; and they only had to wait in line with us.
Ikea does try to make things easier for parents. Most showrooms have little play kiosks, and they have hand wipes throughout the store. The Ikea restaurant has unbelievably inexpensive kids' meals, as well as $.99 breakfasts and $.50 hotdogs. Right after the check-out line you can get a vanilla frozen yogurt cone for $.99, a nice way to end a shopping day.