Review of original post and my list of suggestions to include:
1.2)
# Shove ideally would be an attack and not a (bonus) action; 5th level Fighter, Barbarian, Paladin, Monk & Ranger get extra attacks, so they should be able to shove two creatures or try to shove one creature twice
# Noticed a bug: “You make a strength (Athletics) or dexterity (Acrobatics)” can only use strength (Athletics) and I think it’s how Larian implements it. Can use dexterity only when defending (i.e. you use force to shove, but you can either use force to cancel the effect or try to avoid it with dex). I would also include “The target must be no more than one size larger than you” to shoving, because it’s hard for me to imagine 30lb Halfling to be able to push 600lb Ogre.
i'll edit about ennemie's size because you're totally right.
About shove as an action I don't really know... I guess it's part of larian's vision to offer us "more" things to do.
Personnaly I don't find this necessary but i'm not sure it breaks anything as a bonus action (everyone is able to shove, but your melee classes won't be able to do it more than once).
# Help as bonus action or reaction falls into the same problems as described by Isaac in 0.1) (free Advantage that kills many skills and abilities that cost full action and/or resources). For 3 minutes explanation of cool effect of Help as an action:
https://www.youtube.com/watch?v=1Vmc3ka7CsMAbout Help I'm not sure it falls into the same problems.
As you notice I imagine this as a bonus action, still to fit to Larian's vision that find we don't have enough things to do in D&D.
According to me it's possible to have Help as a bonus action, but of course not as an advantage because it would exactly fall in the backstab/high ground problem.
I'm not against such bonus but if there are reasonnable.
According to me we shouldn't be able to have +5 (or advantage) such easily with a bonus action, but why not a +2 or +3 ?
2.1) Climbing in D&D normally costs twice as much as walking, so if you want to climb 30ft ladder, you have to use two turns (or Dash). Stopping in the middle of the ladder if you have no more movement should be a thing (potentialy not being able to use action like attack with a bow). There are special skills that make climbing faster, e.g. lvl 3 Rogue Thief: "you gain the ability to climb faster than normal; climbing no longer costs you extra movement”.
This could be cool but I really think it would be hard to implement. How to show players they're not going to be able to climb until the top of the ladder ?
I think a : "you can" or "you can't" climb is easier, but i'm not a game dev.
5.1) This looks very good:
https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=702825#Post7028256.2)
# Remove monetary cost of writing spells into book (cost is a thing in D&D, but I feel it doesn’t make sense with money devaluated by access to too many magical items and being able to steal thousands easily)
# Don’t add monetary cost to spells (e.g. Familiar), unless the cost is very big that it would matter (same reason as above)
I'll edit and add something about this.
