Passage Ticketing Ideas

When I'm adding Guest tickets to a transaction in Admin mode and then I want to clear out the tickets to choose a different one, I have to select the (+) or (-) until the cart is clear... sometimes I have hundreds of tickets in the cart and this takes FOREVER! Why is there not a "Clear Cart" option when viewing in Admin mode? ALSO - Once a promo code is applied, there is no way to remove it and use a different one... instead you have to clear the cart and start over. When I'm sending invoices and trying to get the $ amount to within a budget, I use multiple codes to see what it will bring the transaction total to... but I have to clear out the cart (slowly) every single time and then re-try a new promo code. Please fix this!