Darro's Temperature

Hi All,

I made a mod called Darro's Temperature.  My mod adds a temperature system that is configurable. I have a few questions to ask. 

1. I know how to add tags to other mod's armors so that they work within the system. Am I allowed to just do that, or do I need permission?  

2. I have a procedure that searches nearby blocks in a cube every 5 seconds. Right now, I have the default range of this to just one, but I am wondering if that is too conservative. I tried to turn it up a bit and it worked fine, but my computer is pretty good. The default range is configurable in the config.

3. I have a procedure that generates a config file, and then a procedure uses the config to fill in variables. If I update the mod, however, the old config file will stay which might cause an error. How is this handled normally? Should I rename the config file every time I update?

Thanks!