i think the following feature will be very useful:
if you mark something in the text input field, and rotate the mouse while it is marked, then the marked word will be subtitle with the words contained in Glipper.
so many times i want to past a word i marked into some field, but when i choose the input field, its previous input got marked, and i "loose" my middle mouse paste option. to "fix it",i need to go to the input field, delete the word in the input field, go to Glipper and change it to the previous marked word, go back to the input field and press the middle mouse.
with the suggested feature all i will have to do is to rotate the mouse until the desired word appears.