Just my 2 cents:
2) Why Tai-Sheung Lao-Chun is revered by the Taoists
For me, Tai Shang Lao Jun 太上老君 is a honorific name
In the past, people thought that there is "Something" outside of human. "Something" that is much bigger, older, source of everything, the most respected, etc....
But, what is that "Something"? How should we refer/call this "Something"?
Then someone gave a honorific name as Tai Shang Lao Jun.
(3) How should we regard the worship of the Taoist Gods?
I think the Taoist deity is not forcing people to worship them.
People just give respect to them.
Even if people don't care about the Taoist deity, nothing will happen.
(4) Do you know the Taoist ways in questing for longevity?
The taoist is take care of their physical body, maintain it through a healthy food, exercise, etc.
thats why there are many PE invented by the taoist master such as Taiji quan, Wu qin xi, Qi gong (breathing exercise), wushu, etc.
On the mentality, they are practicing meditation, to controll the stress, balancing the hormons, etc.
the traditional chinese medicine was originated from taoist master as well,
they are pay attention on the nutrition, thats why they are climb the mountain to gather the herbs like ginseng, etc
they are using accupuncture & accupressure to help regulate the qi through the meridian (which is until now, modern science still can scan the meridian through x-ray, mri, etc right?)
(5) Do you know what are Chai and Chiao?
Sorry, I dont know
(6) Do you know the basic features of the canon of the Taoist scriptures?
what do you mean with basic features?
if i understand correctly, the taoist scripture (dao zhang), is a collection of taoist book from various taoist school.
(7) What do you know about the Taoist sects in Hong Kong and their relationship with those in China?
quanzhen pai, surely have link with quanzhen pai in mainland, the headquarter is in Baiyun guan, in Beijing
zhengyi pai's head quarter also in Long Hu Shan, China