Your point totals look right from this end. For larger games, this does sound like a solid way to go, where you can get the advantages of both major markerlight platforms. Hope it works for you!

Total 216?

Stealth Suit x3
Team leader
bonding knife
Fusion blaster
Markerlight
HW-drone controller
Hw-Multitracker
Drone controler x 2
Markerdrones x 6

total 297
This way I can still field 2 Crisis elite teams and 2 Drone squadrons (cheap and manueverable fodder)

Your point totals look right from this end. For larger games, this does sound like a solid way to go, where you can get the advantages of both major markerlight platforms. Hope it works for you!

Total 216?

Stealth Suit x3 90
Team leader 5
bonding knife 5
Fusion blaster 2
Markerlight 10
HW-drone controller 0
Hw-Multitracker 5
Drone controler x 2 0
Markerdrones x 6 180

total 297
This way I can still field 2 Crisis elite teams and 2 Drone squadrons (cheap and manueverable fodder)

1. A marker drone becomes the same type as the unit to which it's attached. When it's attached to a stealth team, it becomes Jump Infantry (jet pack). Since it then counts as having a jet pack, it gains the Relentless rule, which allows it to move and fire heavy weapons.

2. You're absolutely correct. As long as the unit hasn't moved (since markerlights are Heavy 1), any of the PFs may choose to fire their markerlights or their pulse carbines (or rail rifles, if they have those). You can split up the weapons any way you choose, so long as all fire is at the same target. Don't forget, though, that since the PF markerlights aren't networked, the rest of the PF unit can't gain any benefit from its own markerlight hits.

Question: markerlights are heavy 1 — does that mean that a markerdrone loses movement in the turn it's used, and as such ties the whole stealth unit up for that turn?

Secondly, I've been looking around, and I think you have hinted at, although I thought I'd ask you to confirm: a regular PF, they get to use either the marker light or the carbine each turn, is that correct? can the team be split in this regard as long as they aim at the same unit?

Question: markerlights are heavy 1 — does that mean that a markerdrone loses movement in the turn it's used, and as such ties the whole stealth unit up for that turn?

Secondly, I've been looking around, and I think you have hinted at, although I thought I'd ask you to confirm: a regular PF, they get to use either the marker light or the carbine each turn, is that correct? can the team be split in this regard as long as they aim at the same unit?

As far as Pathfinders and their transports, the main problem I have with using them as taxis (and believe me, I've tried) is what it does to your tempo while playing. You're going to lose at least one turn while you load the FWs into the 'fish. You can get around this by deploying the PFs and their transports separately, but then the 'fish loses the PFs' scout move, and the PFs lose the 'fish's mobility. There's also the DoW problem, as you mention, which can cost you even more time. In a game where you can only count on 5 turns of play (and maybe not even that in a tourney setting), a mechanized army needs to be mobile for as long as possible, not sitting around and waiting for a cab.

When we're doing the cost of a Pathfinder squad, the cost of the transport doesn't necessarily count against them if you're taking an equal number of Fire Warrior teams. In non-DoW scenarios, you can simply hand off the Fishes to the Fire Warriors to ride in. If you were going to mount up a single Fire Warrior squad anyway, THEN the Pathfinder's points economy comes into its own.

I think the Stealth Spotters can be of use and consideration is due them, but what really does it for me is losing the Elites slot to a (cheaper!) Crisis Suit team, and I roll missile/plasma.