G'day Dave (from another Dave

) welcome to the forum

As for heat issues, there has been a bit of a discussion on this topic...
http://ozstoc.com/index.php?topic=7621.0(As a side note, with old topics like this, you can reply and bring them back to life even if it has been a while since anything was last posted

)
Anyway what worked for me on my old ST was a
Bagster tank coverThis blocked all the heat that was coming off the tank from getting to my legs

(They come in a wide range of colours and you can also attach some awesome tank bags to them)
You'll find a lot of guys use these, although they aren't cheap (brand new) I consider it to be a worthy investment

(This is the shop I brought my new one from:
http://www.aussiebikershop.com.au/index.php?item=366 )
Hear are some pictures of the Bagster Tank cover on my old 2014 ST1300 (Not the best pictures but you can get the idea)

As for the modification to the seat the guys are talking about... there is a guide on the forum located here

:
http://ozstoc.com/index.php?topic=11369.0Cheers
Shiney