just some idea's I came up with (no clue if they are good or not)

mayby have specialised robots--> recharger bots+builder bots+ transport (items). these robots would already have some stuff programmed into them but can only do these specialised things. mayby even have them excel at their specific job for instance transporter bots can carry more items. recharger bots have a faster movement speed. etc

conveyer belts: these could either transport items or robots (for faster movement speed) this way you can possibly have a bunch of robots at 1 space just grabbing items and putting them in storage. 

grabby arms: these are kinda connected to the conveyer belt in the way that they grab items and mayby can do interaction faster than regular robots but they cannot move.

boats: this way you can mayby carry items efficiently over the water+ its a lot quicker than building an entire bridge (especially when you need to cross a bigger place). this will mayby result in shipbuilding etc.

enemies (probably the worst idea on this list) but mayby you can add some kind of enemies that you can capture or kill. this way you can also add tanks or turrets armour and all kinds of stuff.

garderobe: mayby have some kind of machine that auto equips robots with certain pieces of gear (this can also work with the combat idea) and also give them more of an identity. mayby even have it that robots that go trough it pick random items that you put in it so  that every robot has a unique piece of clothing combination.

shirts: with the new edition of whool you can craft shirts, mayby you can then craft dye's with flowers so you can give them different colours (you can ofcourse also give hats new colours because why not).

these are just some idea's I got. so tell me what u think.  I personally think this would make the game quite interesting. 

mayby the community has way better idea's than me (most likely) so tell me what u think would improve the game

and if the developers happen to read this: you guys are doing a wonderfull job :D