The rules allow for consumable items, and magic items, so single-shot items you call "scrolls" could be allowed. I know I'm planning on having them - even if I have to house rule them. Each would be either a single-use ritual scroll (mentioned explicitly on page 134 of the Rules Compendium, or page 298 of the PHB) or a consumable magic item-scroll which is equal to a daily-use power at either a higher level of mastery and/or from a different class. More importantly, I'm creating consumable magic items with effects that aren't currently in existing powers.
I've had many an AD&D game session take an amazing turn - like when when the cleric is incapacitated, the party is on the ropes, but the fighter whips out a scroll of Healing God's Blessing (something I made up). I'm not giving up that ability for players to surprise me and especially my monsters.