It's probably not a great surprise to discover that this big-hitting feat belongs to Chris Gayle: his undefeated 104 for the Kings XI Punjab against the Sunrisers Hyderabad in Mohali in April 2018 contained 11 sixes and a solitary four.
Australia hurtled to 482 for 5 in 86.5 overs on the first day against South Africa in Adelaide in 2012-13, mainly thanks to Michael Clarke, who was undefeated with 224 at the close; David Warner and Michael Hussey also made centuries.
The short answer is yes: Graham Gooch scored 456 runs - 333 and 123 - for England against India at Lord's in 1990, which remains the most in a single Test. The record he broke was 380, by Greg Chappell, who made 247 not out and 133 for Australia against New Zealand in Wellington in 1973-74.
The exciting inaugural (and presumably only) Bob Willis Trophy final, between Essex and Somerset at Lord's, was the first fixture scheduled for five days in England that wasn't a Test since the MCC Bicentenary match, also at Lord's, in 1987. Before that, the five games between England and the Rest of the World in 1970 were all scheduled for five days. They were marketed as Test matches at the time, but were later ruled unofficial.
Pakistan's Kamran Akmal made 60 dismissals in his 58 T20Is - 28 catches and 32 stumpings. Among keepers with more than 12 dismissals, the only other one with more stumpings than catches is Mohammad Shahzad of Afghanistan, with 26 and 28.
Steven Lynch is the editor of the updated edition of Wisden on the Ashes