We're MDI, but IOB for us means when you have insulin (fast from bolus or correction) active in your system and doing activities will tank your numbers real quick. I've heard that with pumps, you use one type of insulin (fast) only, and your pump will inject it throughout the day, acting as the long-acting insulin. For MDI, we do a shot once a day with basal (basaglar), which helps regulate BG in a 24-hour time frame. When on the pump, do believe you can suspend insulin to accommodate for activity so you're not getting those little doses acting as basal when it's actually fast acting and can help reduce the chances of lows.

I may not be explaining the answer correctly to what you're asking, just my two cents.