Thank you! I was pleasantly surprised what an active community this product has and the uses people come up with.
That the Client can not do it is a bummer but I see that this might be hard to implement, since you already pointed out that actually reading the temperature will probably be the hardest part.
I have done a quick search and it seems that it might in fact be so difficult (because of different standards used by hardware manufacturers) that I cant do the data collection myself but need to use something like this.
I will most likely only ever use this machine with windows, so C# will probably be fine. I actually wrote some small useless programs with C# before, like the kind of programs you write in an IT class in school. But I never had the motivation to do more since I didnt see the practical use for me. Maybe this is finally the time for me to learn some programming 
Once I have the Flex I will get to it!