Deleting articulation, accidentals, etc. by double-clicking
When adding articulation,accidentals,etc. one needs to double-click the corresponding icon in "Palettes" panel.
But when one needs to delete it, he should click on the element on the score and press delete. In case of lines it is ok, but when it comes to small articulation signs like "staccato", this procedure becomes inconvenient: it's even hard even to click the "staccato" sign.
Solution: adding option to delete such signs by selecting the note it attached to and double-clicking the corresponding icon (staccato, accent, etc.) of the "Palettes" panel (see the GIF attached).
Also when note is selected, in "palettes" panel the categories which contain signs attached to the note, become bold (the text font is bold for this categories or underlined or has some other color, etc.). And the articulation sign in the category should have some noticeable background color (see screenshots attached)