>1. There are some so-called "common" words that you cannot use in a search, even when searching ONLY the titles, and when combining with other words as well. So if I want to search for "form events", I cannot, because "form" is a forbidden word.

When you want to search for an exact match, you have to change the type of search.

>2. Again, if I want to use a short word or abbreviation (such as "IP"), to find messages with titles containing "IP address"... well, that's forbidden too because IP is less than 3 characters long.

Same thing here.

>3. Finally, the search engine frequently comes back with a message like: "An unexpected situation has occurred... blah...blah and will be logged".

I have no log here. Please, send me an email directly when you have such situation. Provide search criterias you use, etc. I will then be able to help you. Otherwise, I just don't know about it and you won't get any help on it.