Whitehead Professor of Political Philosophy Dennis F. Thompson, chair of the Allston life task force, said yesterday that while some of the options may seem unlikely, the committee only put its weight behind plans that were “win-win.”

“We put them there because we think they really will have benefits for the community as well as for Harvard,” he said. “We didn’t put any options that we thought a reasonable member of the community would reject.”

He added that the committee was very impressed by a potential SMRTram vehicle that holds 60 people and runs on an eight-foot-wide lane. Because the vehicle is so narrow, two-way shuttles could run in a single lane.

“The only problem is that it doesn’t exist yet,” Thompson said, adding that engineers have said it is feasible.

The task force also recommended that planners investigate the less likely proposals of bridging over Soldiers Field Road and developing a regional transportation center, with commuter rail, a T stop and Harvard shuttle stops, in the area.

The committee pondered three cultural scenarios ranging from merely moving the Museum of Natural History to creating a “museum of the world” that would combine the natural history museum, Peabody Museum and Harvard University Art Museums into a complex that would “exhibit 90 percent of the history of the world.”

The group’s report also recommends creating extensive arts space. Thompson, who is also senior adviser to the president, said that planners reached a consensus about the need to expand arts facilities.

“Everybody agreed that one of the things we need to do in Allston is to make up for some of the deficiencies in undergraduate arts space—dance, theater, practice rooms,” he said. “We need to do more in Cambridge but there’s not a lot of room.”

In moving to expand graduate housing, the group is contemplating modeling that housing along the undergraduate House, rather than the apartment, system.

The report also eyes the Quad as valuable space that would allow the University to meet its commitment to offering housing to 50 percent of its graduate students without much further housing in Allston.

For campus planning, the group outlined four models ranging from typical college quads to an integrated urban campus.

Summers said the University’s Allston master planner will consider the four reports after the planner is chosen in about a month. He said the committee charged with selecting a planner has completed most of its work but has not yet made a formal recommendation.

“The committee I think has some ideas as to where it wants to go,” he said Wednesday. “But we have not made a decision.”

The field for master planner has been narrowed down to four finalists: Foster and Partners; Cooper, Robertson & Partners; Skidmore, Owings & Merrill; and Rafael ViÄnoly.

Professor in the Practice of Urban Design Alex Krieger, a member of the committee, said Summers had urged them to speed up the search so that ground breaking in Allston could begin as soon as possible.