About #1, there is another thing that could be useful :
Document Options -> Times signatures -> Uncheck "Display Courtesy Time Signature at end of staff systems". This will of course apply to the whole document and at the end of systems, as opposed to the Measure Tool method, which can be used for specific measures anywhere.
MacOsX 10.11.6, Finale (25.2), 2014.5, 2012c, Mac Mini Intel Core i7 2,7 Ghz, 16 Go Ram, Dolet 6. Azerty kb. Full TGTools. MOTU Midi Express XT USB, Roland Sound Canvas SC-88vl, MOTU Audio Express.