I completely agree with making "Shovel" a once per long rest item ability rather than the current 1 time use scroll. Shovel's dialogue even says it's old master never summoned it for anything fun. That implies it was being repeatedly summoned and is simply not possible with a destroy on use scroll.
While on the topic of quasits...I noticed before patch 3 that the quasit frighten ability was once per either short or long rest. Don't know if this was changed but far as I know it is the only summoned pet ability that has a rest limit. Imps can fly each round or turn invisible at will, spider(ranger) pets can spam aoe webs every round but quasits can only frighten 1 thing? I think that should be changed.