In arithmetic nodes we have options for spline length, percentage along the spline, and also for the section too.
It'd be really useful to add a further submode for 'Material Sub-Spline'. So for example this would allow us to scale mapping appropriately along a spline sub material for example. For example I construct a wall along a spline, and I want to put advertising on segments with spline mat id 2. But the default segments are only a quarter of the length mapping I want for the advertisement. This way I could scale things correctly easily.
That said knowing how many segments will be in that section (another others) too could be super useful, as even though a line is say 10m long, if the section is 2.5m long, there could be 4 or 5 segments depending on where the spline starts. I guess I'm coming round to it'd be nice to have a post 'geometry' pass for uvw?
Sorry a bit rambling, unsure as to what the best way to approach the situation is...
(At present I modify the uvw afterwards to fix UVW issues)