I found this in DCS World\Config\Input\CommandMenu\keyboard:
return {
keyCommands = {
{combos = {{key = 'F1'}}, name = 'Command menu item 1', down = ICommandMenuItem1},
{combos = {{key = 'F2'}}, name = 'Command menu item 2', down = ICommandMenuItem2},
{combos = {{key = 'F3'}}, name = 'Command menu item 3', down = ICommandMenuItem3},
{combos = {{key = 'F4'}}, name = 'Command menu item 4', down = ICommandMenuItem4},
{combos = {{key = 'F5'}}, name = 'Command menu item 5', down = ICommandMenuItem5},
{combos = {{key = 'F6'}}, name = 'Command menu item 6', down = ICommandMenuItem6},
{combos = {{key = 'F7'}}, name = 'Command menu item 7', down = ICommandMenuItem7},
{combos = {{key = 'F8'}}, name = 'Command menu item 8', down = ICommandMenuItem8},
{combos = {{key = 'F9'}}, name = 'Command menu item 9', down = ICommandMenuItem9},
{combos = {{key = 'F10'}}, name = 'Command menu item 10', down = ICommandMenuItem10},
{combos = {{key = 'F11'}}, name = 'Command menu item 11', down = ICommandMenuItem11},
{combos = {{key = 'F12'}}, name = 'Command menu item 12', down = ICommandMenuItem12},
{combos = {{key = 'Tab', reformers = {'LShift'}}}, name = 'Command switch dialog', down = ICommandSwitchDialog},
Does someone know how to assign it to Hotas WH ?