Ah yeah, we have definitely had multi-referendum votes. Still done on paper. For example, here's the ballot paper for most recent one we had in BC [0] (with only two questions): https://3yvac3s24fb2wj4gx27tcv71-wpengine.netdna-ssl.com/wp-...

[0] https://electionsbcca.blob.core.windows.net/electionsbcca/re...