Most spells in Elden Ring can be charged for more damage or even just to delay casting, but in DS3 there's (iirc) exactly one chargeable spell and it's a miracle located toward the end of the 2nd DLC

It's absolutely viable but kinda boring imo. Precious few spells are anything more than a big damaging projectile. Farron flashsword and greatsword are both great tho

It's a weird bug with steam input and the exact version of Unity TC uses for their native Linux builds. Something about an out of date SDL version iirc. Switching to proton fixed it for me on an Xbox controller.