So clicking numbers 1-8 (not on the numpad) you can change the item you hold. 1-6 being normal kindness cards, 8 being a speaker, and 7 being a big heart which does the same thing as pressing B. However, 1-6 and 8 only work if you have at least 1 kindness card or a speaker respectively. 7, however, appears at any time, as it works like B. But, if you have a 7 card held, and click 1-6, you can get a kindness card that works without having one in the first place. So starting the run, you do 7, 6, space. This would also save time at the end because you can keep clicking 7, 6, space to get 1 card when you use all of them.

Low% no hearts maybe?