Hey, Luiafk, I have 2 little requests (code/utility wise, lots of text just for clear explanation):
1) could you add an option for skybridge and subway (possibly also hellevator so we can quickly "build" vertical shafts) to build it similar to how grand design works (draw a line, unlimited range)? As it currently stands, I don't use those tools since I dislike destroying EVERYTHING from one border of the map to another to have a platform/bridge/tunnel longer than I really need. Drawing should be locked to horizontal only or only the "release point's" vertical position should decide where the tunnel is placed. Likewise with Hellevator, only it should lock vertically. BTW Hellevator may look hard to use efficenlty at first, but you could just dig straight down (tool time + miner set + potion helps a lot) and then use that temporary tunnel to draw a line for proper hellevator.
2) What about an option for wall rod/combo rod to automatically replace current walls? Basic Wall Rod isn't that useful in it's current state (limited range), which Combo Rod greatly improves upon, but it's still very tedious to remove walls manually (or with smart cursor) before I can build a wall for my underground tunnel in efficient manner (smart cursor with builder's potiom, gizmo and tool time).
Whether you add those options or not, your mod is already a HUGE improvement to my Terraria experience and I will keep using it.
So, for all the work you've already done:
THANK YOU!