What's so hard about right click and drag? (Or CTRL+something if you have bad default keys..)
Only time I saw someone use (or try to) scroll bars in Altium, it was an older coworker, who was probably raised on DOS or early Windows EDA. The days of the two button mouse, if you had one at all. He never quite got the hang of the part where the scroll bars are absolute referenced, so you go a little ways and OH SHIT WHERE'D MY BOARD GO. Na, I don't think Altium ever intended scroll bars to be very useful, not in any version I've used anyway..
Only time I've ever done work on a trackpad was in Ultiboard, in college. On those odd times when I didn't have a mouse handy. It's absolutely possible, just more tedious. Altium, more so, especially in 3D view.
These days, even if it's just doing a review meeting, I bring a mouse. It's that worthwhile, and so silly without.
Tim