Kinda.. But no triggers are involved in doing them like that, just rotations of both sticks.
You get stiff legs when you use triggers, as it is part of the 3rd animation if you like when you do double grinds.
As for slides, you can grab the nose in a tail as you know but if you keep hold you can't Ollie :/
I'm sure you can glitch it some how. I've never looked into/spent time on doing/trying it since s2 when me and slamooh was trying get them.
BTW... HCH, Win .. UG version