The server admin can already do that. Also, I think they were talking about improving solo play so skills are gain faster than server play, as well a sleep function for those solo that want to speed up the world :)
While I've seen some plants grow back naturally (aka they appeared after I harvested them), I really don't have a solid answer for you to respond in terms of how quickly they recover or how the recovery happens. If somebody more familiar with the game could explain the regrowth mechanic, I'd love to hear from them too.
The only thing the agriculture skill seems to do is increase seed yields and unlocks the ability to create fertilizer. For most plants, if you want to increase the yield (aka the number you acquire from harvesting each plant), you need to increase the gathering skill instead.
It does seem to be possible though to over harvest plants in the wild and cause a plant to be gone forever... potentially eliminated from the world entirely and destroyed in such a manner that some skills are completely unobtainable and that the world is dead to players.
I've had an earlier rant about the agriculture skill on another thread and frankly it is very murky how it works. Most players treat farming like they were using Minecraft where they randomly create farm plots irrespective of the local environment and plant whatever they think they need in whatever quantity they want. I know that doesn't work either.
Regardless, a good guide to farming is most definitely in order and documentation is non-existent regarding the incredibly complex interaction that takes place to really master the skill and understand the mechanics in this game.
The problem with coins is that other players need to accept them in their stores. IMHO it is a good move on the whole, but it does have some issues. If you mint coins but nobody takes them, it still does you no good. If you can get a large group of players on a server to accept coins, you are in really good shape though.
People properly running stores will be both buying and selling products. For instance, I have a carpentry shop that makes furniture and lumber but buys logs. If you are willing to put in some effort harvesting trees and bring logs to the store, you will get the in-game currency to buy the other stuff at my shop. That is the kind of thing most people should be doing... and make it pretty reasonable. I have high efficiency in carpentry, so new players to a server would be better off selling logs to me and getting the stuff rather than training carpentry and instead concentrate on something else.
As for wheat, it seems like heavy harvesting of wheat removes it from the wild. The server I'm using most of the time now has a "community wheat farm" to help out with this sort of situation along with a chest of wheat seeds that is open. Still, if it wasn't for that farm, most new players would be out of luck trying to get the agriculture skill book. It makes cooperation so much more important on a server which has been running for more than a couple weeks.
If people on the server you are using are hoarding something like wheat and not letting you at least get a few wheat seeds to sow on a plot of your own, it is time to move on to another server.
most my base is underground so yeah i needed to build a seperate house above ground so i wouldn't be destroying rooms, but also housing bonus is broken everytime server restarts it's back to 0 or just moves around randomly, and i have to go to each room and pick up 1 item lol xD alphas