hi,
about services started with SYSTEM logon probably you can are right, but the mechanism of registry coping between Install mode and Execute is almost complicated and in the doubt, is better if you use classic way (install/execute)
Regard applications (no services) also if not pubblished,
they will be executed by an user also if is is an admin:
local Administrator or Admin or domain\superAdmin are different users and for each of them, TS will be copyes of registry 1st time they logon on the server. For these appl.
sure they go installed by classic way.
bye