No, don't do that - it'll increase your boot time somewhat as all the preinit scripts load, check whether their application exists and then bail.

preinit is clever enough to ignore unexecutable scripts, as shown by your log. At one point it wasn't - I assume that your running a recent version. I don't think that it has changed in ages though. so you probably are. We use permissions to decide what is going to run - this made it possible for mkprgpt to provide a bunch of scripts for various applications that could then be tweaked fairly easily, without anyone having to vi them from scratch. I would suggest that the M30emptriv permissions are wrong (based upon a previous post listing which scripts should execute) and need to chmod'd;

chmod 755 /programs0/preinit.d/M30emptriv


Aside from that, nothing in the log suggests that N10telnetd or M50gpsapp aren't executing. The log lists those scripts that didn't execute, and those weren't in that list.
Now, if you're testing in AC mode then gpsapp won't start. the 'incar' application is used to ensure that gpsapp only starts in DC mode. So you'll need to force DC power to see GPSapp on your hijack menu.
I suspect that telnetd is running. Why do you think it isn't?