I don't think they need to put up signs indicating if the municipality maintains them. People don't really care. Just put them back up.
I'm guessing restoring the connecting links would only apply to highways that actually serve a highway function or reconnect broken sections. I doubt we'll see Yonge St. becoming Highway 11 again.
A continuous Highway 7 could be back, but I'd still prefer it remain under municipal control in York and given a proper name.
Some of the worst examples are Highway 9 - which still exists in two separate sections as the section between Harriston and Orangeville was downloaded, and Highway 3, which is now three separate sections (Fort Erie to St. Thomas, but not including the section through Port Colborne, and between Leamington and Windsor).
I'd like, most of all, for Highways 2 (as the alternate to the 401), 3, 4 (at least to Highway 10), 7, 9, 11B (in Timiskaming), 17 (east of Ottawa), 19, 21 (south of Highway 402), 24 (Cambridge to Caledon, if not all the way back to Collingwood), 28 (Port Hope-Highway 115), 33, 27, 59, 67 in Timmins, 86, and 121 between Minden and Haliburton to be fully restored. I don't care who maintains them, but a "maintained by ______" tab underneath the highway shield if necessary.
Highway 7 is probably okay through Brampton and York Region without restored signage (though I'd argue it should still continue through to Highway 410 in Brampton from the west, instead of abruptly in Norval), but it should be restored westward to Sarnia.
Many other routes, like Highway 18 south of Windsor, Highway 22 near London, Highway 76 in West Lorne, the southern section of Highway 121 (though Kinmount), Highway 93 between Highway 11 and Highway 400, made sense to download. Highway 11 probably didn't need to exist anymore south of Barrie. But there were too many important through routes and connecting highways that were thrown away without any planning in the Harris fire sale era.