I suggest there should be a "Ice Only" and "Iceless". Ice only would be where you can only touch ice, if you touch something other than ice then it wont be a valid speedrun (excluding the non-ice you spawn on) Iceless would be the exact opposite of Ice Only. In Iceless you would have to avoid the ice at all costs. If you touch ice, Then it wont be a valid speedrun.

If this was the wrong place to suggest this, Then inform me, And I'm sorry. If these speedrun types would be impossible, Inform me, And I'm sorry.

You shouldn't need to be sorry, you are allowed to have ideas and express them! Unfortunately though it is a creative idea, this would be borderline impossible to moderate. Not only would the moderators have to go almost frame-by-frame in certain levels, but the HTML5 version of the game doesn't have character shadows which makes it extremely hard for anyone to tell what specific tile the character is on.

It's a fun concept, but sadly Ice Only and Iceless would realistically speaking not work out well. If you want to you could set personal challenges like this, go on ahead! Even if I'm discrediting it, it might be a fun idea to try out!

As far as I can tell, new category ideas have come and gone very quickly, seeing as how the Run3 Speedrun community has become somewhat stagnant I doubt that more categories are being added anytime soon even if the category would be really good.

TLDR: Adding new categories is an idea that some people have wanted for a while, but we haven't really gotten any as of recent. Ice Only and Iceless would be hard to enforce and is a fun idea for challenge runs and more personal competitions. Even if the people running the leaderboards agreed, most people don't run ILs, or do runs at all at this point. As of writing this the most recent run was a month ago, and the most recent W-Tunnel runs were last year (Only 2 people did it last year and one of them was me). There would likely only ever be around 2-6 people who would end up running it.

Sorry D:

If you want to propose more categories, you are welcome to suggest them! (I hope so at least, I don't make any of da rules so tale this with a grain of salt).

Edit 1: Didn't realize that this was about the W-Tunnel and not the game as a whole, but my point still stands.

Edit 2: Updated the time since last run. Jeez I did 1 of the 2 most recent W-Tunnel runs? AND it was a year ago? Man, I feel old.