1. You can get notifications by enabling it on gear manager -> notifications -> more notifications -> tick any app youd like.
2. Maybe firmware update will fix it. Check in gear managee.
3. Afaik you wont get much use for youtube on the gear without a null rom with bluetooth internett teethering. But you can backup youtube app from phone with astro/es fileexplorer and sideload them from pc. There are tutorials on how to sideload in the forums.
Hope this helps mate
sent from my carrier pidgeon
Phone: Samsung Galaxy S4 i9505
Rom: Stock, Rooted Android 4.4.
Tablet: Samsung Galaxy Tab 2 10.1 p5110
ROM: Mokee 4.4
Smartwatch: Samsung Galaxy Gear SM-V700
ROM: deodexed rooted stock XXUBNA3.
Phone: Samsung Galaxy S
Phone: Samsung Galaxy SII
To the Galaxy and beyond......