I think we do not need that kind of effect. We have plenty of instant cast and swiiftcast for moving. I think it is good as it is now. THere is plenty of situations where you can use it. Like in leviathan once you wanna dot tail, second cast get interrupted without surecast or once spumes explode your cast may get interrupted by damage without surecast. In shiva extreme if you stand still and take ice ring damage, you can keep casting with surecast but without it your cast can get interrupted by damage.