Dummy indicators

[maxbruening]

This is a great extension! Would it be possible to make the package recognise either:
(a) \mathbbm{1} from the bbm package OR
(b) \mathds{} from the dsfont package?

Right now I can create a dummy indicator sign for word using \mathbb{1} but this does not work in Latex!
Thanks a lot for your efforts! :)