Hello

Actually only first argument is used to find related command. : is used to group and split command.
Is not possible to provide multi arguments and found related command.

Could be nice to support it

Example :
app.php object:list [args...] [options...] or app.php object:add [args...] [options...]
to
app.php object [args...] [options...] app.php object list [args...] [options...] or app.php object add [args...] [options...]