Benefits:

• Lower server / client load while using FMP & Buildcraft Silicon
• Compatible with other mods(like Red Project & Gregtech CE)
• Expanded number of facades

Disadvantages:

• Incompatibility with older versions

How would this work with the phased facades?

Phased facade can be implemented as BC block(all panels are FMP single block). And they should act like other similar blocks(ex redstone bundle from Project Red): if it was connected with proper block(pipe with wire), did same things like now, else be in default state.

Benefits:

Lower server / client load while using FMP & Buildcraft Silicon

You can just turn off BC facades in the config btw

Compatible with other mods(like Red Project & Gregtech CE)

Do many other mods have support for it? I know a lot of other mods have moved away from it in the past to MCMP or their own solution. So why do you suggest FMP over MCMP?

Expanded number of facades

What blocks do not have BC facades which shouldhave/FMP has?

Disadvantages:

• Requires an external mod which does against BC's no dependencies rule
• Is written in SCALA so is very diffucult to integrate with
• Doesn't provide all the functionality that facades offer
• It has been known to be very buggy / have alot of performance issues in the past

Not happening unfortunately - a while ago there were plans for a multipart API to be a part of forge, but that hasn't happened. Perhaps in the future though.