An optional request: Add constant variables for these values so they aren't magic numbers.

For example:

```DM
var/const/NO_SLIP_WALKING = 0
var/const/SLIP_WALKING = 1
var/const/NO_SLIP_WALKING_SLIDE = 2
var/const/SLIP_SLIDE = 3
```

An even better idea would be to turn them into bit flags, would make it more readable with

```DM
SLIP | WALK_ONLY | SLIDE
```