I suppose I view this question on a simplistic platform. If both teams are playing in the conditions, then the game is fair and no extra precautions should be used (I believe they can all ready include extra drink breaks if need be).

So if it is hotter for one team due to winning of the toss, then so be it - the same thing happens under other favourable and unfavourable conditions so why not hot temperature as well.

If the player is suffering from the heat, they will do one of two things - get out if they are a batsman or try and fight it and suffer the conciquences. I think Mark Taylor, Dean Jones and Ponting have all suffered from batting long innings in India - its part of the game there and is why it is so tough to beat them - that is there conditions, like Englands is swinging conditions.