With the removal of most of the kit commands, builder is the only "free" way to get them back. You can also just pay, and become VIP.. and get all of the same perks, plus more. This leaves absolutely no incentive for a VIP to work towards builder.. or even for non-vip's to try and get it, because it's easy to just think "Nah, I'll donate next (whenever) and get all that anyway.) As such, builder needs to have a few things added or changed. Nothing unreasonable, or server breaking.. but those of us who are willing to put in the work on builds, able to con(vince) people to sign off on books, and willing to pay the cash for the rank should get something that's outside the norm, which you don't get just for being VIP.
Simple ideas being
Ideally these would reflect on the achievement, which is "builder".
An armor kit, including helmet with Respiration and Aqua Affinity on it, and boots with Feather Fall.. say usable every few days - as an example.
Also, maybe a redstone kit that gives a small amount of powder, a couple redstone torches, a repeater or two, maybe a comparator. (Just enough so that, if you're just shy of finishing a project, you can just /kit it.)
Low level buffs that reflect on the achievement, such as Haste or Jump (similar to pyramid effects, but not as powerful as a large pyramid)
A small admin shop specially for builders, with a limited selection of items that are a bit more difficult to get. **To prevent econ issues, builders would not be permitted to set up shops selling these item types, or items that can be made from them, if they use the admin shop.
Essentially, the Jobs plugin, but limited to builders. No leveling, just a very small amount of money, and only for placed blocks. Nothing to get rich on, just a way to get a little extra pocket change for those of us who put in build effort.
Again, nothing game breaking.. one suggestion I saw that was great was /top (put you in the first open space directly above your head)
So far, pets are just for show.. if they're not going to be made combat useable, perhaps a second pet for builders? Not really related, but it's something different.. and with so few of us shouldn't trouble the server too much (I think)
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No doubt there are other ideas out there - and likely a lot of "that's not fair!" complaints about these suggestions.. if you don't like 'em, please give us some other ones. Yes, I'm trying to promote my own rank here, but it's something not very many have worked for (and gotten), even though it's reasonably possible for anybody to get.. given time and effort.