That saddens me to hear, after purchasing all versions of SMB on all available platforms (where PS4/Vita and Wii U don't even have Teh Internets!) and the physical version.
As a avid player turned speedrunner since release all I really wanted for SMW back when you guy's were still doing it back on the orig SMB forums I just wanted the editor/uploading...but most of all the functionality that the 360 had in Teh Internets (best chaps of SMW) with LB's and lvl saving. The Editor and uploading is all fine, but the REAL long term staying power is in the IL/Any% speedrunning scene and simply adding a already existed once feature (with a new OST nobody really liked vs the original) isn't really going to bring the PC version to competitive parity w/ the 360 version.
Although, I am glad you're fixing the CS issues, may I add a idea that might not be hard to implement. The ability to turn on and off the upward wallslide glitch in in-game options (or what have you). Also, the replay timer glitch across all versions atm would be nice to see finally fixed.
Anyway, if you read this, thank you for reading and listening.