(1) i am just worried that the mirage drive will get caught on the bottom when it gets shallow, or when there is a tree in the water if the mirage will get caught and broken.
(2) is there any way to remove the drive?
(3) or is it flush enough to slide over tree trunks?
(4) sometimes ill fish it on a lake and id like to have the drive then. but as for on the creeks what do yall think?
I see your question as 4 parts, so I'll try to answer in 4 parts.
(1) The Mirage drive can be "fluttered" close to the hull so you can propel yourself in as little as 3 or 4 inches of water. You need to be aware of things in the water, but the Drive is very tough, it can take a beating. Different users protect their drives to different levels. I like to baby them a little bit, but others run them up on sand, don't worry if they nudge a tree etc. The parts that break are all replaceable. The Turbo fins have masts that don't go right to the end of the rubber, and sometimes after hitting too many things, a small hole can develop. I used the fins with that small hole for an entire season, and it wasn't a problem.
(2) Yes, the drive can be removed in LITERALLY one second. It clicks in like the seatbelt of a car, and clicks out in the same way. 1 click and it's in, two clicks and it's out. Simple! Awesome!
(3) You can leave the drive in, and it will within half an inch of the bottom of the boat if you spread the pedals. So yes, you can often leave it in.
(4) With Mirage drive boats, people almost always take the drive. It's up to you if you want to leave it in or take it out, depending on your creek. You'll know within 30 seconds of using your boat if it makes sense to leave it in instead of out.
Finally, You really should try to see the boat in person. Having a good look at it with a knowledgeable salesperson will help you a lot.