Help understanding the Firmware

What i mean by help is a couple questions I'm a little stuck on, I downloaded a version of FiveD that will work on an atmega328 (since this is what i use am familiar with) but I can eventually get a Sanguinololu if need be.

I know that the Firmware is:
Responsible for interpreting G-Code
Controlling the stepper motors
Manipulating the extruder with the correct G-Code
Communicating with the PC

What I'm unsure of is:
Does the firmware control the extruder temperature?
Does it control the bed temperature?

My goal is to build a mill AND reprap in one, so i would like to know if i can either segment the "heated" control into another circuit OR add a switch and just tweak the firmware so when the switch is in one position it doesn't start/control heating.

Quote

Does the firmware control the extruder temperature?
Does it control the bed temperature?

Both: yes.

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

so then can i assume if i use the firmware everyone else on here uses, i can mill and print from the same machine? just by swapping out tools?

There are at least 4 Firmwares "everybody else" uses: FiveD, Teacup, Sprinter, Marlin. Regarding Teacup I can confirm it works for full 3D milling, even if spindle on/off commands aren't fully evolved, yet.

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Generation 7 Electronics	Teacup Firmware	RepRap DIY