Dutch Prime Minister Ruud Lubbers said last night that President Reagan is considering a nuclear arms proposal that would allow the Soviet Union and the United States to deploy a limited number of missiles in Europe.

Such a proposal would mark the first time the United States has gone beyond Reagan's "zero-option" goal under which the Soviets would dismantle their intermediate-range missiles aimed at Europe and the United States would forgo deployment of Pershing II and cruise missiles in Europe.

Lubbers spoke with reporters at the Dutch Embassy several hours after meeting with Reagan at the White House. At that time, Lubbers gave no indication that the president had indicated that any proposal short of the zero option was being considered. But Lubbers said later: "The zero option remains the central theme and the central goal of the western position. I also understood today that that is the position of the president. The question is, how do we come to this result? There he is also prepared to discuss an interim solution."

Lubbers added that although Reagan may not have labeled such a proposal an "interim agreement," Lubbers came away from the meeting certain of Reagan's "preparedness to negotiate steps--that cannot be doubted."

When he was leaving the White House, Lubbers said in an official statement that the NATO allies remain united.

The Washington Post reported yesterday that the administration is considering a new proposal to offer to the Soviets, although no agreement has been reached on specifics.

In another development at the White House yesterday, presidential spokesman Larry Speakes told television camera crews that they were "snooping" on Reagan by filming him through the windows of the Oval Office as he waved his arms and frowned during a meeting with aides.

Speakes said the Oval Office is off-limits to television cameras, and complained that some TV reporters were forcing their camera crews to take potentially embarrassing pictures of Reagan when he is not aware that he is being filmed.

Speakes' complaints about the television camera crews came after Reagan had left the Oval Office to be photographed with Lubbers.

"The cameras should not shoot when they are not inside," said Speakes.