Yeah sazed does this a few times in final empire where he taps and stores a lot of strength. the quote is from the coppermind. the only reason a feruchemist can only store at a reasonable rate is because they cant store 100% strength without dying due to all of their mussels like the ones in their heart being too weak. But it is possible to store all of your weight. This wont make you phase through something because feruchemial weight has no effect on mass.