Right-to-Left in Yiddish in Pages for Mac
Pages 5 does have paragraph direction controls. See

https://support.apple.com/kb/PH15331

Regarding 4, you can make text replacement sequences in system prefs/keyboard/text

Regarding 1 and 2, you might ask in the group devoted to Ukelele

https://groups.google.com/forum/#!forum/ukelele-users

In that group they suggested opening the layout with the latest version of Ukelele and setting the Language to Hebrew.  I tried that and saved as a bundle and it did the trick:  The layout appears under Hebrew instead of Others and periods go in the right place.