I like the V-cut in the Tri Tac screen. I'd been thinking of other screen modifications along similar lines - but more of a |\____/| shape in a landscape format screen than a deep "V" in a portrait orientation.
The Tri Tac screen is available in electronic format with some of their games now and has changed a little since I bought mine. One change is that it's now designed to be constructed in two parts, not joined in the centre. The plan was then to produce a series of low "bars" with specific tables to fit their different RPGs, which would be slotted in and attached between the screen halves with paperclips, letting you tailor the screen to the game you were playing. A clever idea, although to the best of my knowledge they never followed up on it.