The second question is the answer to the first question... :)
If you set your "calories to burn weekly" a little higher, then your calorie range will go up to accommodate that extra movement and maintain the same deficit.
You can do that on the homepage - click the 'change' link next to your fitness goal to "Burn xxx calories per week" and set any number of calories you think is realistic for you.
As the PP said though, make sure it's realistic, not a high target you attempt to meet. Your food calories are calculated from your goal, not from exercise tracked, so you need that to be realistic.
If you increase calories burned and the nutritional range doesn't change (and especially if it's 1200-1550), that is a sign that your expected rate of loss is probably too fast for someone of your current size and you should realistically set your goal to lose your weight a bit more slowly.
Deb, in New Zealand