REF: added more option into register_multimodal
REF: added more option into register_multimodal

Former-commit-id: abcd08177a0ddc454b5921d7ef13dfd046388c17 [formerly ff7e3d2e29596cc2832eecb30763eceb23553300]
Former-commit-id: 597062dc30242b04d6527040c3401b972db94778
Former-commit-id: 22eab419c0dde534c442048559de4f7e321ec513
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox