Marking enemy units has a big influence on the outcome of a battle. Reporting contacts accurately and fast can save a teammate or allow them to get a kill easier, but often you find yourself in situations (mainly as infantry) of chaos and constant enemy encounters where you cant afford to open the report contact window, left click one of the unit type boxes and move your mouse down to another button to finally confirm.
That's why i want to suggest a classic yet effective way to report contacts faster, which would also give an incentive to do so when under pressure.
Upon right clicking on the map, the usual options would show (add waypoint, report contact, center on:) but if while still holding right click, you hold left click on report contact, a new scroll wheel type selection would show, allowing you to quickly select a unit type upon dragging the mouse to the angle of one (right click could be lifted once the wheel opens) and marking once you release left click. This would allow you to report a contact in around a second since the moment map is opened.
Someone reading this may think it sounds confusing at first, but i've seen it implemented in other game in a similar way and its very easy to get used it.
Im also suggesting it as an additional form because the current window has a text box which may be useful in some cases, though i wouldnt have a problem if this replaces it.
Also regardless of this suggestion, the mark waypoint button when you're mission leader should be below report contact and not above, as your mouse is defaulted to that option when you right click. I think it has less importance and use than contact report.
I made a quick-ish representation of what it could look like.