There is no forum based notifier when you are quoted on the forum, but you can use one of multiple mechanisms:
a)   Use the forum’s search function at will (which is what I do):
https://bitcointalk.org/index.php?topic=5338176.msg57042061#msg57042061

b)   Use external sites and/or notifications through Telegram. The two most popular I believe are:
-   https://bitcointalk.org/index.php?topic=5248878.0
-   https://bitcointalk.org/index.php?topic=5331343.0

Concerning your second question, you shouldn’t really post multiple posts in a row on the same thread, especially if it’s in a very small timeframe. It you want to answer to 10 people on the thread, you can quote the relevant part of each of them, and answer below each quote, providing multiple answers in a single post. If the post ends-up being rather long, you may reach the post size limit and need to post a couple in a row (reaching post size limit should justify this).