covaithe
Explorer
Or they could always take close attacks [Thunderwave,
Burning Spray] to be effective in melee range. Or take a power like
Storm Walk that allows you to shift THEN use ranged. Right out of the box the 'ranged' casters aren't inefective in melee range. Reaper's touch would just make them more effective.
This is a bit disingenuous. I'm sure you know that there are other tactical considerations restricting close attacks, such as not hitting your allies.