Foram Gosrani: T20 skills are those which help players turn around games in the space of just a few overs. If a player uses them to turn around a test within a session, forcing a result instead of a draw, it helps not just the player but the game as well. This is more likely to help batsmen but bowlers too will know how to best use their T20 skills in a Test.
Monish Moorthy: T20 doesn't need any special 'skills' it only encourages risk taking. Big hitting and disciplined/attacking bowling are the basics of cricket, they did not come with T20 cricket. T20 keeps players from planning longer innings, from bowling sustained attacking spells and the shift in mindset is the biggest problem that T20 brings with it.