Thomas, maybe implementing this suggestion would help?
http://roadmap.cintanotes.com/topic/13907-clip-text-into-currently-edited-note/ 

Maybe it will fit the bill if the links are not in the text but in a separate field?
Please take a look here: http://roadmap.cintanotes.com/topic/104471-note-to-note-generalize-link-field-adding-power-and-flexibility/

Well I used the term "mouse-oriented" more in the "not-keyboard-oriented" sense. Of course the visual indicator function is also very important, however since there is no keyboard shortcut for Ctrl+Clicking on a tag, where probably won't be a shortcut of double-clicking on a tag.

Thanks for the suggestion, Jeroen!

The idea is nice and I really like it, but still there also are advantages of having a separate Link field. Note that I'm not arguing about whether the Remarks field is necessary ;)
However votes are showing that the users are not concerned with this problem - alas, only 4 votes in 3 months..

Right now the tab size is not changeable, sorry. There is however this suggestion on the roadmap: http://roadmap.cintanotes.com/topic/79780-configurable-tab-to-space-autoconversion/ 

Sorry for the delay! Good idea, thanks, added it separately here: http://roadmap.cintanotes.com/topic/114892-browse-button-in-the-link-field/   Please vote!