Copy doesn't copy time signatures

Although I'm new to Muse Score I have been a programmer for almost 60 years so I am aware that I may have not thoroughly digested the controls required to avoid these problems.

Problem 1: when I select multiple measures and multiple instruments, hit CTRL-C and then paste later in the score the internal changes in time do not get copied. In this case there are at least 3 changes. It starts in 3/4 for one measure, 2/4 for 1 measure, 4/4 for another measure and back to 3/4 for the balance of the clip. Is there a special mode required to ensure the copying of the time signatures?

Problem 2: Several places in a choral arrangement I want some tenors to hit a half note, and others to hit two quarter notes. My way around this is to replace the half with two quarters on the same pitch since the synthesizer will make it sound the same. Another solution (ugly) is to change the score to have two tenor lines - tenor line 1 does the half note, tenor line 2 does the two quarters. It works but makes the arrangement overly tall. Makes it so that only 5 or 6 measures can fit on a page. Again, if there is a special control that allows dissimilar notes to co-exist in a single line I'm not aware of what it is.

Thanks for your help
Dr. Robert Hitchcock