Hi Itamar,
thanks for your detailed feedback. Let's go through it:
One airport I testen (LMML, Justsim) is not recognized at all. -> I can't confirm that, works fine for me. Please try to delete apt.cache in the scenery Earth nav data folder to force a database regeneration. If that doesn't help try my version: apt.cache
At some airports stands are deemed ' unreachable' even when on taxiway next to the stand, or on the chosen stand itself. (EPWA DD Design, LGRP FSDG) -> First try deleting apt.cache here as well (we will do that automatically from SAM 2.1.6 on). Sometimes the route network is not sufficiant for a parking position which causes your mentioned message. In EPWA I found "LOT Service" parking position. There is no taxiroute network (yellow) nearby. Up to the scenery author to fix that or simply open the scenery in WED and add the routing.
In one case when turning of the runway the follow me drove through me in the opposite direction onto the runway. A then called another one, for an adjacent stand. The first one also caught up and then there were 2... (LGAV, FlyTampa) -> We're already aware of that issue and fix it soon
In general there is a bias to the right. see picture in LGKO (Gaya), but also for example in EDDM (SFD) where the SAM VDGS is spot-on centerline but the marshaller has this same deviation about a meter to the right. It almost like it wants to put the captain seat on centerline instead of the nosewheel.. -> There is a pretty simple reason for that. FollowMe is based on the route and stand data saved in the scenery (created in WED). Depending on the workflow of the scenery developer this data is rather good or bad. In worst case the routing can be offset by meters from the taxiline or parking position visible in the scenery. DD EPWA is such a case. The blue circle (our debugging for parking positions) should be centered on the line but it isn't so the marshaller will be offset. The VDGS uses another technology and is not related to FollowMe in any way.
Finally SAM 2.1.5 has just been released. You may try that as well.