First of all, i think that some people will call these ideas too ‘micromanagement’ ones. But some players, i guess, want Cataclysm to be rather hardcore than casual, and may be there can be two game modes - casual without all this ‘micromanagement’ and hardcore.
Items:
Weapon add-on - rifle belt. This add-on allows you to wear rifle, shotgun or SMG on torso slot, giving you 1-2 encumbrance. Craftable.
Blanket - clothing, covering all the body except head, extremely encumbersome.
UPS - it should be reworked. Instead of (on) and (off) it has to be (plugged) and (off). Why? Because of its volume and huge appetite every turn it’s nearly useless to carry night-vision goggles or high-tech weapons. Instead of this it would be wounderful to write energy consumption of different items. For example - for NV goggles it’s ~20 energy points per turn, for Plasma Rifle - 50 per shot.
Ammo magazines - i know, that it was discussed for many times, that it requires ‘micromanagement’, but it is necessary and hardcore. Plus it will make revolvers and bolt rifles more useful, especially for a beginning - they don’t require clips or something. And speedloaders for revolvers would be nice too.
Changes:
Torso encumbrance - it’s okay to make your combat skills lower, but attack speed penalty is too high. Wearing polo shirt and light jacket makes you too slow in combat, while wearing bulletproof west with something else makes you useless. Penalty has to be halfed or split between torso and arms encumbrance.
Mutation and bionics - in early versions of mod mutagen made your character ‘feel strange’ and mutate after some time with high food and water consumption. So you couldn’t savescum and it was more realistic than momentally-grown tail and beak. Please, return it to game.
Same with bionics - as i see, bionics is some kind of nano-implants than grow in body, building useful structure. So, this may take longer than one moment. Let it be so - applying implant takes ~hour and gives you ‘Implant installing’ effect with occasional (depends on bionic - you can’t replace your arm with fusion blaster without painful procedure) pain and lowered dexterity. After some time - 5-12 hours, depends on bionic complexity, you got a result. As a benefit - you can no longer savescum with bionics.
Start settings - skill and trat-attribute points should be split, because most of the people don’t take skills at beginning at all. Maybe skills should depend on choosen profession - who has your character been before the apocalypse. Peaceful professions require no points at all - clerk, driver, etc., but some useful ones with good starting equipment (policeman, fireworker, etc.) should require it. Also, it may be good to choose time of starting - in very-very ‘Hour Z’ or after some time from disaster. It affects number of NPC and monsters hanging around and world condition - for example, if you start in a week after disaster, you’ll find looted shops, lot of burned houses and rotting corpses. It will be harder, but instead you can pick better starting profession and items.