Our project wants to (fill in the blank) as an innovative strategy. Is this eligible for IDc1?

Usually the answer to this question is "maybe." There are very few preapproved innovation strategies (education is one of them—see above), so with all but a few it is hard to say definitively whether or not it will be approved on a LEED project. However, there are some reliable guidelines that any project should consider:

If pursuing Option 2, what is the scope of the energy model if the space shares a central plant, and what type of software should be used?

If your space shares a central HVAC plant you need to model the whole building. Consider using energy modeling software, like eQuest, that can separately account for the energy use of the base building separately from your project space by adding additional electricity and gas meters for each space within the model. This is easier and more accurate to model and more likely to be accepted by GBCI reviewers.

We are working on a project outside of the U.S. What options do we have for an alternative but equivalent standard to the MERV 13 filter.

USGBC has published alternative compliance guidance for projects outside of the U.S. and outlines the following alternatives to the MERV 13 rating.

Equivalent filtration media Class F7 or higher, as defined by CEN Standard EN 779–2002, Particulate air filters for general ventilation, Determination of the filtration performance.Equivalent filtration media with a minimum duct spot efficiency of 80% or higher and greater than 98% arrestance on a particle size of 3–10μg.

Can we use pre-filtration in combination with filters that are less than MERV 13 in order to earn the credit? For example if we use carbon pre-filters combined with MERV 11 would that work?

This could work but the burden will be on your team to demonstrate that the filter combination is as good or better than MERV 13. Try focusing on the percent efficiency that the filter combination has for removing varying sizes of particles and compare that to the corresponding efficiency of MERV 13 filters.