Could threads be further indexed for easier back-searching or is there a way?

This can be achieved, to a certain extent, using Google's advanced search option. Googling for "billium248 site:www.chess.com/forum" locates all the topics Billium248 has either written or been mentioned in. To restrict it to just the ones Billium248 has written, use  "by billium248" site:www.chess.com/forum".

The most detailed level of resolution for topic contributions (both within Forum Searchand via Google) is down to the containing page - about ten or so postings. Chess.com currently supports tracking of Topics on a per user basis. If it offered tracking of individual postings instead, the number kept track of would increase, probably by a factor of 5 .. 10.   

These discussions also contain tips on searching:

http://www.chess.com/forum/view/community/forum-feature-i-would-like

http://www.chess.com/forum/view/help-support/is-there-any-way2

http://www.chess.com/forum/view/help-support/privacy-and-google-searches

http://www.chess.com/forum/view/chess-players/posting-the-obvious

https://www.chess.com/forum/view/help-support/lost-forums

http://www.chess.com/forum/view/help-support/search-with-two-keywords

http://www.chess.com/forum/view/help-support/help-with-help

http://www.chess.com/forum/view/community/forum-filing

Not forgetting that you can go back and re-edit all of YOUR OWN posts, so you could insert tags. e.g. your topic SIMPLE LOCAL TIME NOTE  is hard to find when using forum search for "SIMPLE TIME". If you were to edit the first post and put in a unique keyword, you could find that topic more easily. In that discussion, I mentioned "Mountain Std Time" (I'm avoiding the full word in THIS discussion) - which is an uncommon phrase in chess discussions. Hence, when I use Google to search the chess.com forums for "Mountain Std Time" (spelt out in full), it takes me directly to your discussion.

You are Amazingly helpful thanks and amazingly knowledgeable-i have started to keep chess .com notebook for "most needed "references