"Select All" button for overwriting previous pricing during price import

When you make a price import for select customers for products that already had special pricing, the price import page asks you to check a box for all rows that previously already had a special pricing. If there are 60 customers, all for whom the same product pricing should be updated and there are say 30 products: that's 1800 clicks. The idea of quickly and conveniently importing several product pricing for several customers at once is lost.