some suggestions:

1.On tab Messages, when I Search and filter messages can you mark color for this search word on list massages (that list contain messages were filtered)?
2. can you improve search and filter messages with special text ( when enable special search) example :
* "without somework" will be return result is all messages that don't contain word "someword"
* word1+word2 will be return result is all messages that contain bolt word1 adn word2
3. option only search on subject, not on messages

1. You can add your own colors in "Settings" -> "Main settings" -> "Colors". Your colors have titles, just added needed. When you filter with that "word" just select all needed messages and mark with one of your own colors with needed title.

You can later filter messages by your color.

2. Maybe.

3. At the moment (version 2.27) when using "Search and filter field" it only searches in the subject, section name and URL. It does not search in message text at all. Will add search in message text as separate option (new button).

2.28:

3. Added new button for searching in message text.

2.36

2. Added special search and filter keyword "NOT". Must written at the start all uppercase. Will filter everything not containing words after it.

3.00:
2. Added special search and filter keyword "OR". Must written all uppercase. For example text1 OR text2, will filter everything what matches text1 or text2.