What I would want in the booster (not all necessary):
1. The ability to use a designer tool that would let you design a house for someone else, then they click on it when in the proper sized plot to copy the design into their saved design gump. They would then click on house customization to restore it, and they would commit from there. Both accounts would have to have the booster.
2. Tower, Keep and Castle variations as follows:
a. Same floor plans, but one can change the tile styles for the walls (whole building) and floor tiles (by floor).
b. slightly alternate floor plans; these too could choose alternate tile settings.
Examples: a castle with larger ring wall rooms but no center building or overhead walkways, a Keep with a central courtyard, but no in-wall voids, a large tower with no "wings", but a couple squares wider, and different internal room configuration, alternate versions of these and other classics such as the L-shapes and small stone workshop that replace all stairs/ladders with a few teleporters. Rotated versions of the true-L-shapes and the semi-L-shaped classics (square or rectangular foundation with an L-shaped building - there are several) so that their "courtyards" can be in any of the 4 directions, with minor changes to the interior to relocate the entrance area back to the south face after the rotation (hence the suggestion of replacing stairs with teleporters).
3. Access to place houses in areas currently set to no housing, that otherwise could legally have housing due to terrain and GZ issues.
4. Minor overhaul to servers to increase the Z-Axis allowed in-game. This would allow some places that run up on the current top-Z to have 3+roof houses that would otherwise be limited to shorter ones. This could also theoretically allow cellars to be developed later (if they reassigned the current "0" Z to be a higher number). Also, since they would be tinkering with the Z axis, they could make some of the water areas back boat-accessible (all it would take to make Justice Lake usable again would be rocks across the falls, to keep people from turning their boats into airships). Even access with rowboat would be okay.
5. Another 20%-40% storage.
6. Choice of _one_ "Enhanced add-on" to place in one's house (in the customization window) that affect crafting. These would give boosts to skills used in the house as follows:
a. Oven/grill combo: bonus to cooking, and access to new recipes that only the appliance could make (some mundane, some special)
b. Writer's Desk: bonus to scribe chance of adding properties to spellbooks, and a form of LRC that applies to scribing ingredients (both reagents and special ingredients)
c. A special mannikin and hat form that gives a bonus to enhance leather items (If they haven't yet allowed crafting cloth hats with runic properties, perhaps this would allow it).
d. A medium forge that gives a bonus to enhance metal items (smith and tinker), and to craft glass items. Smelting ore on it would give an extra ingot per 10 ingots' worth of ore smelted (rounded down)
e. A Saw table that gives a both exceptional & enhancing bonuses to carpentry, bowcrafting & Masonry items, as well as a secure container that logs could be placed in. The table could them be used to cut log piles into boards in amounts that backpacks can't handle.
These would be cumulative with any other items.
They would be placed by clicking a button in the housing menu, and targeting the desired location in the house (so both custom, classic, and revised classic houses could have them). They could be relocated as needed, but switching types would have a 7-day counter between placement.
7. The option of placing a second house of any classic design, up to 81 tiles (9x9 or 8x10), but ONLY on a different shard than you currently play. It would roll both your houses into "Grandfathered" status, to where you had to refresh one of them on a regular basis, and attempting to turn the second house into a custom house or larger than the stated limits, would make it your primary, and cause your main to start decaying.
