Revert "i9500: Add KeyDisabler class"

This reverts commit 6d5b726479bf0fbfe5453316c6cd31e535990f93.
Revert "i9500: increase ui responsiveness"

This reverts commit ef397edc8307104b299280a3d3571fe52c0ae8ad.
Revert "Revert "i9500: Add KeyDisabler class""

This reverts commit 0a3f15b65dc8a020dd1fab80bc3ddf4e49119974.
Minor tweaking