Jumper and Laser Blaster may be skills that can be considered in the future; the former in particular, whatever the answer is on "Will this be a worthwhile addition?" will be much easier to determine (at least in theory) due to that we can take examples from how useful it's been (or not) in Lix, which has had it for quite some time. On the downside, Jumper would also be one hell of a pain in the ass to code (Laser Blaster on the other hand would be quite simple to implement, but instantly accepting a new skill just because it's easy to implement would set a very dangerous precedent).
I don't see enough value in Rock Climber to consider it. Except for maybe a very small number of puzzles based on using them together with regular climbers, I'm not sure what potential exists for them that isn't covered by regular climbers, apart from perhaps some puzzles that involve both types of skills in the same level with some rough walls and some straight ones.
Shimmier, I can't say much as I don't remember what this skill does (keep in mind, I was never too much of an L2 fan).
But for now, let's assume that no new skills are going to happen outside of this one maybe. I'm not saying this as in "It will never happen, no matter what", but more as in "For now, let's just worry about this one potential new skill, and also keep in mind that the primary goals at the moment are (from highest priority downwards) fixing the existing physics, switching to friendlier file formats, improving the UI, and improving performance; not introducing further new features".