Definitely possible. Assuming you're using the Default layout, it should be very easy, as there's already a property set that displays the clock cell with a red background.
Edit the Clock cell. Select the "Breaks" Property Set and press the "Conditions" button. Click the "Use advanced conditions" checkbox. The Conditions should have the following:
(!isRound)
That makes this property set selected when the "isRound" variable is false (it is true if it currently is a round, false if it is currently a break). Incidentally, there's also an "isBreak" variable, but I think it was added after these layouts were created. Anyway, change the conditions to:
isBreak or roundNum >= 12
That should do it.
Now, if you wanted the the clock text (not the background) to be red instead, it will be a little trickier. That's because there is a property set for even-numbered rounds, and one for odd-numbered rounds ("Default"). You'll need to have two new property sets, one for even and one for odd, that get used only when the round number is greater than 12.
- Press "New" to create a new property set. Name it "Even Rounds 12+" or whatever you want.
- Press "Copy" and select the "Even Rounds" property set to copy the properties of the Even Rounds property set.
- Click the Font to edit it, and change the text color to red.
- Press the Conditions button, select "Use advanced conditions", and change the conditions to:
isRound and (roundNum % 2 = 0) and roundNum >= 12
- Press "New" to create a new property set. Name it "Odd Rounds 12+" or whatever you want.
- Press "Copy" and select the "Default" property set to copy the properties of the Default property set.
- Click the Font to edit it, and change the text color to red.
- Press the Conditions button, select "Use advanced conditions", and change the conditions to:
isRound and (roundNum % 2 = 1) and roundNum >= 12
And finally, use the up/down buttons to move the property sets such that they are in this order:
Breaks
Even Rounds 12+
Even Rounds
Odd Rounds 12+
Default