2. No, as long as they are on the same Intel controller (here I'm not 100% sure, so try googling for a precise answer).
3. TRIM is not yet supported in RAID for Z77 (AFAIK), so I would connect the SSD to the ASMedia controller, if Intel SATA is set to RAID. Here's a post that might help: http://www.tomshardware.co.uk/forum/286329-14-comparing-controllers-sata