We haven't really had enough riders to justify a tandem class. What I have done, in anticipation of tandem antics in the 2021 season, is fettled the new scoring system to understand two riders with the same lap times. Previously it's had them finish one after another, which is suboptimal as it may lead to disgruntled stokers, and The Stoker Is Always Right.
(I had a comedy bug where it was only allocating points to even-numbered places for a bit (I reckon this would be a fun event to run). And I've jibbled it to throw enlighteningly sarcastic error messages if you forget to tell CrossMgr the length of the track, rather than barfing out with ArrayIndexOutOfBounds, which isn't the sort of thing you want to deal with in a tent in the pissing rain while a worrying puddle forms under the power supply
[1].)
I will attempt to make barakta earn some real BHPC points in something eventually. At this rate, it may have to be Arm-powered
[1] Disappointingly, this sort of thing isn't what the industry refers to as 'Extreme programming'.