Make a button like that:
@keydown:none
Go TABGROUPLOAD=MoI3D TABCLOSEALL
@keydown:shift
Go TABGROUPLOAD=MoI3D TABCLOSEALL=no
https://docs.dopus.com/doku.php?id=reference:command_reference:internal_commands:go
https://docs.dopus.com/doku.php?id=:reference:command_reference:command_modifier_reference