There's no real way to "deal" with it I don't think. It's kinda like men trying to "deal" with women when they're PMS'n lol!
My one mare, Chico isn't kicky or squealy but very
flirty. When she's in heat & another male horse (stud/gelding) is around she gets super distracted and is constantly nickering for them.
I have a Fjord mare that squeals major when in heat & around geldings & though I havent seen her kick yet, i'm pretty sure she has the potential at that time of the month lol.
Some people don't really like having mares along in a group for a ride, but i've found that the mare isn't always the problem. Alot of the time a bad reaction (squeal/kick) stems from a gelding trying to shove his nose where it doesn't belong, which is the gelding's
rider's job to keep him away if the mare might kick.
I've noticed that an in-heat mare can also cause some geldings to become "studdy" and distracted.
I had my mare up on a weeklong mountain trip last summer when she was in heat. She was the only mare there out of 8 horses and the one causing troubles and acting "marish" was actually a 5-year-old gelding, so you get the bad behavior in both genders.