Drogers, welcome to the forum!! I fully agree with the 'preplumb' a line into the pool folks (we do it, but call it a 'reserve' line - just in case one of the return lines eventually breaks, you've got one already plumbed in, or it can take a 'pressure cleaner"). We have also run a line up through the deck to afford the owners the opportunity to add a slide but this should only be done if you are 90% sure you want the slide (we have 2 pools that have a capped stub of pipe sticking out of their deck for 4+ yrs - they never got the slide but have to deal with the pipe sticking upthrough the deck )
My best advice to you is to run the lines now, but leave them below grade and outside of the deck. I can't imagine that a few pipes sticking up will work very well with your landscaping plan , so keep them below grade. You can either mark their location with a 'decorative rock' or/ and triangulate on them by taking 2 measurements to them from 2 fixed points (the pool corners or a light post and the corner of the house) so that you can easily find them again, if they will be put to use. We do the same thing when measuring an irregularly shaped pool for a cover or liner (it's called an 'A B measure', where we put 2 stakes in the ground 20 ' apart and measure the pool every 2' from both points, which gives the liner or cover manufacturer the shape of the pool via triangulation) Plumbing them will require a little digging but it's cheeper and easier to have them in place already, and any competent installer can handle the waterfeature hook-up.
Good luck with the pool and I hope you can eventually afford to make your dream pool a reality!!