utopia: admins have to take care of this
reality: admins dont do always, or they do wrong
i saw admins slapping/slaying, for example, CTs when c4 was not even planted yet. others slay before round ends, just coz they think the last man standing will not complete the mission, but if there is time still no need to be so fast using ur rights....
as other commented, a plugin like this would be highly unfair (even i asked for add it long time ago too). but there are some situations where u must hide and save ur gun, if u see clearly that have no time for defuse or u got too many enemies in front to be succesfull