Regarding an easy approach to acquiring bias frames using maxim, open your camera control window and select the Expose tab. Then at the right, choose the autosave feature. Pick a slot and click on it to make it active, then where it says type just choose bias and it will pretty much take care of the exposure time (0 seconds) for you. Before you start the sequence be sure to set your CCD cooler at the same temp value you ran your lights.
As for the temp settings, I've been imaging on cool and warm nights and hadn't noticed much fluctuation in sensor temp. I just run my chip at -20 C at all times to promote lower noise and subframe consistency. To answer your question, as long as the chip or sensor temp shows the same temp (FITs header in maxim will give you the aveerage sensor temp per frame including the setpoint) then no you will not need to take a new set of darks.
Example text from the fits header for a single SII subframe....
SIMPLE = T
BITPIX = 16 /8 unsigned int, 16 & 32 int, -32 & -64 real
NAXIS = 2 /number of axes
NAXIS1 = 3326 /fastest changing axis
NAXIS2 = 2504 /next to fastest changing axis
BSCALE = 1.0000000000000000 /physical = BZERO + BSCALE*array_value
BZERO = 32768.000000000000 /physical = BZERO + BSCALE*array_value
DATE-OBS = '2015-08-26T03:50:16' /YYYY-MM-DDThh:mm:ss observation start, UT
EXPTIME = 1200.0000000000000 /Exposure time in seconds
EXPOSURE = 1200.0000000000000 /Exposure time in seconds SET-TEMP = -20.000000000000000 /CCD temperature setpoint in C CCD-TEMP = -19.700000762939453 /CCD temperature at start of exposure in C
XPIXSZ = 5.3984399999999999 /Pixel Width in microns (after binning)
YPIXSZ = 5.3984399999999999 /Pixel Height in microns (after binning)
XBINNING = 1 /Binning factor in width
YBINNING = 1 /Binning factor in height
XORGSUBF = 0 /Subframe X position in binned pixels
YORGSUBF = 0 /Subframe Y position in binned pixels
FILTER = 'SII ' / Filter used when taking image
IMAGETYP = 'Light Frame' / Type of image
JD = 2457260.6599074076 /Julian Date at start of exposure
Hope that helps.
P.S. - With the weather improving, my schedule and the fact my kid is a tad older, I am now able to actually set up and get some excellent data spanning multiple nights from my driveway. I will be posting my image once it's processed so stay tuned